What soil to grow weed from seed

Best Soil for Cannabis

Cannabis, like all other plants, thrives from an ample supply of water, oxygen, and nutrients. These three base components are responsible for your crops’ overall health, growth rate, and final yield.

Of these three factors, cannabis soil composition is one of the most easily modified to suit the needs of cannabis crops. Due to this, marijuana soil mixtures are a booming industry. With this being the case you’re probably wondering is there an overall best soil for cannabis?

Although the nutrients in cannabis soils themselves aren’t altered, they are added in specific amounts that promote healthy growth, and most importantly, healthy soil for growing marijuana. Without this pre-made soil for weed, cultivators would be left to compose their own soil for marijuana.

Pre-made cannabis potting soil allows beginners and professionals alike to jump into the fast lane for growing marijuana plants. You’ll find everything your plants need in these marijuana soil mixes, such as beneficial bacteria, fungi, macronutrients, micronutrients, vitamins, and more.

Furthermore, using the best organic soil for cannabis will provide a more natural form of growth, as compared to the hyper-accelerated growth of hydroponics or aeroponics.

We’ve sifted through the best soil brand for weed to find you the very best soil for growing cannabis. Whether you’re searching for the best organic soil for cannabis or the best soil for indoor cannabis – we’ve got your cannabis plants covered so they can grow on cruise control.

FoxFarm Ocean Forest Potting Soil

FoxFarm Happy Frog Potting Soil

Coast of Maine Stonington Blend

FoxFarm Strawberry Fields Potting Soil

Fox Farm Salamander Soil Mix

Organic Super Soil Concentrated Strength

Purple Cow IndiCanja Organic Living Soil

Roots Organics Original Potting Soil

FoxFarm Ocean Forest Potting Soil

FoxFarm Ocean Forest Potting Soil is a tried-and-true soil mix for much of the cannabis community. It’s one of the easiest soil mixes to use for all stages of plant growth, whether from seedling to harvest.

A massive benefit for FoxFarm Ocean Forest is the fact that it’s already set to the ideal pH range. 6.3 to 6.8 pH is the ideal range for plants growing in soil for nutrient uptake. This makes Fox Farm Ocean Forest soil incredibly efficient, and your cannabis plants will likely show it with vigorous growth.

FoxFarm went above and beyond by offering a two-pack, which enables cultivators with additional potting soil. However, the price comes to around $30 per bag, which is still on the high-end for an organic potting soil.

Although you’ll spend a substantial amount of money for FoxFarm Ocean Forest, it will pay for itself, considering you won’t need a pH pen. If you’re looking for an easy-to-use potting soil mix – this is it.

  • Simple to use soil mix
  • Two-for-one deal saves money in the long run
  • pH adjusted
  • Ideal soil mix for seedlings to mature plants
  • Expensive if only growing a couple plants
  • Not enough perlite for aeration
  • May require supplemental nutrients for the flowering phase

FoxFarm Happy Frog Potting Soil

FoxFarm Happy Frog Potting Soil is one of the best and highly rated organic soil for cannabis plants. It’s perfect for seedlings and young plants because It contains mycorrhizal fungi and other beneficial microbes.

The nutrient source of Happy Frog soil stems from bat guano, earthworm castings, and forest products, such as wood chips. There are enough nutrients to last an entire cycle, from seedling to harvest.

Fox Farm didn’t overdo the nutrient content for a very specific reason, which was not to burn your plants. Many other soil brands create “hot” soil mixes by placing an overly-high nutrient content, but this is not the case with FoxFarm Happy Frog Potting Mix.

This is one of the best potting soil mixes for cannabis, especially for beginners. This is also the best soil for cannabis seedlings because they don’t require a high level of nutrients. If you’ve been looking for a gentle cannabis-specific nutrient mix – this is it.

  • An ideal composition that doesn’t drain too fast
  • Perfect soil for seedlings to mature cannabis plants
  • Comes loaded with worm castings and soil microbes
  • Insect free
  • Doesn’t provide enough P & K for the flowering phase
  • Contains a large number of wood chips
  • Similar to standard garden soil mixes

Coast of Maine Stonington Blend

Coast of Maine soil is a boutique soil mix brand. Their Coast of Maine Potting Soil is intended for growers that don’t want to spend additional money on pH monitors and associated products.

Coast of Maine Stonington Blend Mix is a stand-alone organic super soil mixture that contains mycorrhizae, kelp meal, fishbone meal, lobster compost, alfalfa meal, and worm castings. This organic soil mix is jam-packed with everything your plants need to thrive.

However, all of these high-quality ingredients come in at a hefty price. If you’re willing to stomach the bill, you’ll find a hearty harvest of aromatic and cannabinoid-rich flowers come harvest time if you choose to incorporate Coast of Maine soil.

Although Coast of Maine Potting Soil Mix is expensive, it performs exceptionally well. This is one of the best soil mixes for cannabis we’ve seen, and it’s highly suitable for both beginners and professionals alike.

All in all, Coast of Maine Stonington Blend can be considered a safe bet if you’re looking for a premium organic soil for your cannabis plants.

  • High-quality organic ingredients
  • No need to pH adjust
  • No supplements needed
  • Grows cannabis plants from seedling to harvest
  • Great for plants in large pots & containers
  • One of the most expensive brands on the market

FoxFarm Strawberry Fields Potting Soil

FoxFarm Strawberry Fields Potting Soil is a coir-based mix, which means it will have better drainage and hold less water than peat mixes. Some cannabis growers prefer fast-draining soils to avoid overwatering their plants; however, they may need to water more often with FoxFarm Strawberry Fields compared with growing in a peat-based soil mix.

FoxFarm Strawberry Fields Potting Soil and Ocean Forest by FoxFarm have a lot in common. They’re both made from similar ingredients: worm castings, bat guano, oyster shell, aged forest product, peat moss are the same between both soils. Strawberry fields soil has dolomite lime while ocean forest has granite dust instead. In addition to this, they also contain coco fiber and crab meal shrimp meal kelp meals fish emulsion respectively.

FoxFarm Strawberry fields is a great potting soil that will produce luscious and flavorful buds. You’ll be pleased with the overall cost, appearance, ease of use as well as its beneficial Mycorrhizae bacteria.

  • Fox Farm Quality
  • Priced Competitively
  • Highly rated
  • Buy from reputable seller and check date on product upon arrival

Fox Farm Salamander Soil Mix

Cannabis plants grown in hot climates love to be hydrated during growth phases, and under optimal moisture conditions, beneficial microorganisms will flourish while nutrient uptake will also increase. In the Fox Farm Salamander Soil Mix, we have an ideal soil for rooted cuttings and young cannabis plants that’s also great for both indoor & outdoor cannabis cultivation.

This salamander soil is rich in nutrients, holds water extremely well, and feels almost perfect in texture when it is wet. It’s the best choice for cannabis plants that love moisture as the quality of this soil is top-notch. If you have cannabis plants that require less moisture then this soil can still be used by mixing with a substrate like vermiculite, perlite or pumice stone.

  • Excellent at retaining moisture
  • Another Fox Farm Favorite
  • Quality ingredients
  • Again, as with all soil bought online only buy from reputable sellers and check contents on arrival

Organic Super Soil Concentrated Strength

Natures Living Organic Super Soil Concentrated Strength is formulated to create the perfect growing environment for your cannabis plants. They contain a wide variety of beneficial microorganisms and organic nutrients, all of which work synergistically to provide rapid growth and bountiful yields.

Although Natures Living Organic Super Soil Concentrate is one of the best organic soils for cannabis, it’s still relatively expensive compared to other products with similar ingredients.

A single bag of Natures Living Soil will not fill an entire 5-gallon pot, which makes this an expensive product if you’re growing more than one cannabis plant. Although the instructions recommend cutting this product with a standard potting mix, it won’t last very long.

Furthermore, the Organic Super Soil Concentrated Strength has a strong odor, which is a significant downside if you must be discreet.

Although Natures Living Super Soil Organic Concentrate is a premier potting mix for cannabis plants, it’s not recommended if you grow more than a handful of plants at once.

  • Organic
  • Contains a wide range of beneficial microorganisms
  • Simple to use
  • Perfect for all stages of growth
  • Microorganisms contained with all the nutrients required to take a plant from seed to harvest
  • Very expensive for its small size
  • Will not fill a single 5-gallon pot
  • May contain pests

Purple Cow IndiCanja Organic Living Soil

Purple Cow IndiCanja is the new kid on block in terms of cannabis soil.

Purple Cow Organics produce a whole host of different organic products, including seed starter mix, BIOActive vegetable Supercharger, right up to their Purple Cow IndiCanja Organic Soil.

This plant-based, natural organic soil mix by Purple Cow Organics contains the necessary minerals and nutrients to start your seedlings on their journey. Having been scientifically formulated and tested Purple Cow IndiCanja is lauded by the people at Purple Cow Organics as good for all stages of plant growth, from young seedlings all the way through to flowering.

Purple Cow Organics bills their Indicanja soil as developed by growers, for growers as well as being ideal for beginners or pro’s, an all-in-one soil perfect for every stage of growth.

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We already know about the qualities of someone like FoxFarm Soil, but the big question is, is there room for another organic soil? And ultimately does the Purple Cow IndiCanja made by Purple Cow Organics have what it takes to sit among the top soil manufacturers?

Whilst a small number of consumers have experienced fungus gnats, the top-rated reviews from users so far would suggest they do, but the proof is in the pudding, or should we say the harvest…

  • Certified by the Organic Materials Review Institute
  • All-in-one Super Soil
  • Good for Different Stages
  • Expensive
  • Some Bags May Be Infested With Fungus Gnats

Roots Organics Original Potting Soil

Roots Organics Original Potting Soil is an ideal choice for fast-growing, heavy-feeding plants. It has a balanced air to water ratio of porosity and water retention that allows you to frequently feed your prized possessions without worrying about their roots rotting or drying out too quickly. Roots Organics soil bags double as pots – just cut the top off, drop in your plant/seedling (or sapling) with ease!

This Original Potting Soil from Roots Organics contains many ingredients which work together to provide your plant with the nutrients it needs. It has beneficial mycorrhizal fungi, Funneliformis mosseae, and Rhizophagus intraradices that enhance uptake of plant nutrients as well as increase root biomass.

  • Highly rated
  • Good ingredients
  • All-purpose great for beginners
  • Check sizing
  • Buy from a reputable seller and check for fungus knats
  • Bags are plastic

Best Soil For Cannabis: Buyers Guide

Buying the best cannabis soil for your cannabis plants might not seem important, but it’s one of the biggest deciding factors when it comes to plant health and overall yield.

Cannabis plants take anywhere from 4-6 months from seed to harvest. Clones may take upwards of 3 months to complete their life cycle. Not only is this a significant investment in time, but also the energy needed to fuel their growth.

This is why we’ve compiled this buyer’s guide to help you find the best potting soil to grow cannabis.

Qualities to Look for in a Good Cannabis Soil?

Many ready mixed store-bought cannabis soils are already amended within the correct ratios so should be ready to go in many cases. Of course, you can always amend the soil further if needed and as previously mentioned, many companies also produce cannabis soils for specific stages of growth, so research as much as possible and buy a potting soil that is correct for your individual situation.

Loamy soil is a mix of organic compounds and various ratios of clay, silt, and sand. Loam soil mixes are a popular choice among cannabis growers and should be near the top of your list when searching for the best soil for cannabis as they offer excellent drainage alongside ideal water retention. A quality organic loam soil will be rich in nutrients and provide plenty of oxygen.

More of a coarse soil, silty soil mixes are abundant with beneficial organic minerals. Compared to loamy soil, a silty soil mix can be regarded as having fair-good water retention, with drainage that is about average. Silty soils mixes are very often extremely fertile alongside being very malleable, and easy to amend.

Another coarse soil mix is sandy soil, not the best kind of soil for many cannabis growers as water retention is poor-fair but sandy soil does have the benefit of good drainage! Although a common downfall to sandy soils is the washing away of vital nutrients. Again, just like silty soil, sandy soils are fairly easy to work with and amend.

A heavy soil compared to other soil mixes, clay soils are another soil option for growers wanting a soil mix rich in nutrients and essential minerals, they’re made up of fine minerals. A very good option for organic cannabis grows. Clay soils have very good water retention but perform poorly drainage wise.

Is Growing in Soil Easy?

This is the main question that beginners ask. In fact, growing cannabis in the best potting soil for cannabis is one of the easiest methods because it’s by far the most natural.

The vast majority of cannabis soil brands offer “plug-and-play” soil for indoor marijuana. This means that you don’t need to do anything – except water them.

In these cases, you’ll need to look for the best soil for marijuana plants that are already within the optimal pH range. By finding a pH-balanced cannabis soil mix, you won’t need to worry about complicating matters with a pH pen.

The Number of Plants

Before you give your hard-earned money away, how many cannabis plants will you grow? This is one of the first questions you must ask yourself because it’ll paint a clear picture of how much soil for weed you’ll need.

If you’re growing a single plant or 6-plants in small containers, you won’t require a bale of soil for marijuana plants to fit your needs. Instead, you can get away with purchasing a single bag of soil for growing marijuana to keep your costs to a minimum.

However, if you’re growing multiple plants in large containers, then you’ll need to purchase multiple bags of the best marijuana soil or a large bale-size bag of cannabis potting soil.

Whether you’re growing a warehouse full of cannabis plants or a single plant in your closet, knowing how much cannabis soil you need is the very first step you must take.

Stand-Alone or Supplement-Based?

This is the next important factor that you must consider. Do you want the best soil for growing weed that’s filled with all the necessary nutrition for your plants, or are you seeking a mild soil for marijuana that can be amended with additional supplements?

If you choose the best potting soil for marijuana, then it might not be suitable for seedlings due to the overall strength. If you decide to go with a milder soil for marijuana, then you’ll need to purchase additional nutrients.

Some growers find more freedom in purchasing marijuana soil mixes that contain fewer nutrients so they can fine-tune their overall nutrient content.

However, this method is only recommended for cultivators with experience. If you’re a beginner, fine-tuning soil for weed may prove to do more harm than good.

Beginners will benefit from utilizing stand-alone soil for cannabis because it contains everything your crop needs to thrive from seed to harvest.

Although these products are not packed to the brim with nutrients, they will allow you to grow vigorous and high-yielding crops without the worry of nutrient burn.

Organic or Inorganic?

This is another essential question you need to ask yourself. Organic marijuana soil contains ingredients that are from organic sources (worm castings), which are scientifically proven to be better for the environment and your overall well-being.

Inorganic cannabis potting soil tends to be cheaper in cost, but the price difference isn’t as large as in the past. Ultimately, this is a very personal question that only you can answer.

Living Soil Or Not?

Next, you’ll need to understand if you’re looking for the best soil for growing marijuana that contains beneficial microbes or not.

You may question this idea at first, but fungi (mycorrhizae) and bacteria play an integral role in breaking down nutrients for your prized cannabis plants.

In other words, beneficial microbes facilitate enhanced nutrient absorption, promote root growth, and provides a protective barrier against harmful bacteria and fungi.

Although you’ll likely see an increased price tag on the best soil for weed that contains beneficial microbes, it’s well worth it when you consider the effort it takes to grow high-quality cannabis flowers.

Photoperiod or Autoflowering Plants?

Another important factor to consider when looking for the best soil for marijuana is the type of plants you will be growing, by this, we mean will your grow room be filled with autoflowering plants or photoperiod?

This is definitely something that should be taken into consideration as if you’re growing autoflower plants, then they will likely prefer a cannabis soil mix that is light with few nutrients.

One of the more commonly used substrates growers use when growing autoflowering plants are carefully balanced peat based cannabis soil mixes with coco coir and additional perlite to achieve the required aeration and drainage.

An important reminder regarding soil mixes for weed, especially if you’re considering growing autoflower plants, is heavily fertilized cannabis soils or ready-made stand-alone amended marijuana soils can/will sometimes deliver too many nutrients for young seedlings resulting in nutrient burn (so bear this in mind!).

Additionally, when growing photoperiod plants, it may be more beneficial to start them in a seedling pot with a cannabis soil mix specifically designed as a seed starter with fewer nutrients. You can then replant your precious seedlings when the time is right in a more suitable cannabis soil for the next growth stage. It’s important to remember that mature cannabis plants in the later stages are much better at tolerating much higher nutrient levels than seedlings.

Do You Need Additional Aeration?

Just like animals, your cannabis plants rely on oxygen to thrive. Alongside water and nutrients, air is a necessity when growing cannabis plants in soil.

Perlite is a primary material that cannabis growers use to increase the amount of air inside a cannabis potting soil mixes. Not all cannabis soil brands contain perlite, so it’s essential to understand if your soil for marijuana is too heavy.

Air pockets within your cannabis potting soil mix not only provide oxygen for the roots, but they also allow the root system to expand rapidly.

Furthermore, consistent air pockets within the potting soil mix enhance drainage, which will reduce the possibility of fungus and bacterial rot.

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How To Grow Cannabis in Soil

Growing cannabis in the best cannabis soil is incredibly straightforward, especially when it’s already pH adjusted. Here are a few tips on getting your potting soil ready for your marijuana plants.

The first thing you need to do is fill your container 3/4 full with potting soil. Gently place your plant, and carefully add additional potting soil to cover the roots.

The cardinal rule is never to compact your cannabis soil. Cannabis roots not only thrive from the nutrients within the cannabis soil mix, but also from the air pockets.

These tiny pores keep roots from rotting, so it’s essential that you refrain from pressing down on your cannabis potting soil mix.

If your marijuana soil mix is already pH adjusted, then you simply add water. Always allow your plant to satisfy its thirst before adding more water to avoid overwatering symptoms.

The Definitive Guide To The Best Soils For Cannabis

Dirt, soil, growth medium—call it what you like, it’s an essential component for any cannabis growth operation. In fact, choosing the best soil for cannabis is one of the most important decisions you’ll make in the process of growing your own pot plants.

It’s so important that it can mean the difference between a successful harvest and complete failure. Which would you rather have: bountiful buds or a plant so unhealthy you can’t even compost it next year? That’s what using the right soil can do. So, yeah, a lot’s riding on your choice.

But what is the best soil for cannabis? What ’s the best pH? What if you’re growing outdoors? What if you’re growing indoors? The questions literally go on and on and on. But never fear, my friend. The experts at Honest Marijuana are here to help!

We’ve been growing some of the finest cannabis in the world for almost a decade. And we’ve been doing so the way mother nature intended: in 100-percent all-organic soil, without pesticides, chemicals, or growth regulators.

We’ve learned a lot in those years, and we want to pass on our knowledge to you. To do that, we’ve put together the definitive guide to the best soils for cannabis so you don’t have to worry about your head exploding while trying to sift through all the information. Let’s start our dirt-y adventure by discussing the basics of good cannabis soil.

The Basics Of Good Cannabis Soil

Cannabis is often considered a weed (hence the name) because the plant can pop up and thrive in diverse conditions. But that doesn’t mean you should just scatter your sensimilla seeds in the backyard and hope for the best. This isn’t Jack & The Beanstalk, bro.

Yes, your cannabis weed can grow in a wide range of soils, but to truly flourish—to produce lots of trichomes , THC, and other cannabinoids—it needs just the right balance of variables in the soil. These variables include:

  • Proper drainage
  • Good water retention (sounds counterintuitive to the first variable, but it’s not)
  • Correct nitrogen to phosphorus ratio (this is done in the composting phase)
  • The right balance of fungus to bacteria (a slight skew to the fungal side of the spectrum is okay because cannabis prefers slightly acidic soil)
  • Soil pH of 6

Let’s discuss that last bullet point—pH—in a bit more detail.

Best Soil pH for Cannabis

pH (yes, the ‘p’ should be lowercase) stands for potential of hydrogen. It’s a chemical scale used to specify the acidity or basicity (alkalinity) of a substance ( usually a liquid).

For example, liquid drain cleaner and bleach (14 and 13.5 respectively ) are both very basic. Battery acid and hydrochloric acid (both 0 pH) are both very acidic. Between those two extremes lie more common items, like:

  • Baking soda (9.5)
  • Sea water (8)
  • Pure water (7) (this is considered neutral on the scale)
  • Coffee (5)
  • Lemon juice (2)

Keep in mind that numbers above 7 are basic (alkali), while numbers below 7 are acidic.

So because soil contains water, it also has a pH. As mentioned in the section above, cannabis likes its soil slightly acidic. The ideal number is 6, but it can also flourish on either side at 5.8 and 6.3.

If your soil strays slightly higher than 6.3 or slightly lower than 5.8, the plant will still survive but it won’t produce as well . Keep your soil around 6 for the best crop.

To do this, you’ll need to purchase a soil pH tester. Sorry, there’s just no way around it. Sticking your finger in the dirt and then in your mouth is not an accurate test of pH.

The one consolation is that these testers aren’t very expensive. You can pick up a perfectly good soil pH tester for around ten bucks at Walmart or Amazon.

Of course, there are plenty of more expensive models that do everything but wash your dishes (some even do that), but there’s no reason to drop a c-note for this kind of functionality. Your basic, run-of-the-mill pH tester will do just fine.

Best Soil For Outdoor Cannabis

Natural soil (by that we mean soil found outside) comes in three main types:

But not all soil is just one type. They can be sandy/loamy, loamy/clay, sandy/clay, or any other combination of the three. To make things even more confusing, there can be different ratios of each soil type. And each soil type has its own benefits and drawbacks.

If you absolutely must grow your cannabis outside in the ground, we suggest digging a three-foot-wide, three-foot-deep hole and filling it with the organic super soil we show you how to make below. This will give your cannabis plant the proper drainage, water retention, and amount of nutrients to help it grow tall and strong.

You also have the option of growing your cannabis plants outside in a pot. Just fill a three- or five-gallon pot (or bucket) with the organic super soil we describe below and plant your seed. You will have to monitor the temperature, humidity, rainfall, amount of sun, and pests if you’re growing your cannabis plant outdoors.

The nice thing about growing your cannabis in a bucket or pot is that it’s portable. Weather not behaving? Take the plant inside. Pests attacking the leaves? Take the plant inside.

The only downside to doing this is that you’ll have to spend some money to control the light, air movement, and humidity. But once you’ve got the gear, you won’t be at the mercy of the elements (which can be unpredictable and cruel) and you can give your growing plant exactly what it needs to flourish.

Best Soil For Indoor Cannabis

The best soil for indoor cannabis growing is organic super soil and 420 fertilizer mix . We show you how to make these two indispensable items in the last two sections of this article.

The organic super soil, in particular, gives you the right balance of carbon, nitrogen, phosphorus, and a whole host of other nutrients to ensure that your cannabis plant gets exactly what it needs during every stage of growth . Add to that the 420 fertilizer (you can make yourself) and you’ve got a great recipe for growing tall plants with plenty of buds and lots of cannabinoids.

Of course, you can choose to purchase soil rather than make it yourself. This is particularly good for those who don’t have a lot of space outside to set up a compost pile. We’ll talk about the best bagged soils in the next three sections.

Best Potting Soil For Cannabis

If you must buy a bagged soil and your local garden store doesn’t have a lot of choices, anything with the words “organic potting soil” or “organic potting mix” will work. It’s not the ideal, but it will do in a pinch.

Your best bet is one of the organic soils listed in the next section or the homemade super soil we talk about at the end of this article.

One thing you want to look for when buying potting soil for cannabis is that it does NOT contain any slow-release chemical nutrients. If your potting soil contains these time-released chemicals, it could give your marijuana plant the wrong nutrients at the wrong time. That could spell disaster for your cannabis crop.

If your garden store has more of a variety, look for one of the following brands.

Best Organic Soil For Cannabis

These organic soils have been tried and tested as cannabis-friendly products. You’re still better off producing your own organic super soil and 420 fertilizer, but these can work in their absence. Visit any marijuana-grow chatroom and you’re likely to see these products mentioned more than once.

Black Gold Soil For Cannabis

For years, Black Gold was the go-to potting soil for the discerning cannasseur. Black Gold also makes other additives such as peat moss, earthworm castings, perlite, compost, and vermiculite you can use to supplement the lack of necessary cannabis nutrients.

Fox Farm Soil For Cannabis

Fox Farm is another bagged soil used by cannabis growers. The Ocean Forest mix is particularly effective at giving your cannabis plants just the right soil conditions to grow their best.

To give you an idea of what’s in the mix, here’s a breakdown of the Ocean Forest ingredients:

  • Sea-going fish emulsion
  • Crab meal
  • Shrimp meal
  • Composted forest humus
  • Sphagnum peat moss
  • Worm castings
  • Oyster shell
  • Sandy loam
  • Bat guano
  • Granite dust
  • Norwegian kelp

Doesn’t sound appetizing to me, but cannabis plants just love it.

Best Soil For Autoflowering Cannabis

The amount of light a plant gets during the day is responsible for making that plant flower . These are called photoperiod plants. Cannabis plants grown outdoors need between 12 and 15 hours of light per day. That usually doesn’t happen until later in the summer.

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Of course, that variable can be controlled by growing your cannabis indoors (where the plant needs closer to 18 hours of fluorescent light).

But some cannabis plants are what’s known as autoflowering. That means the plant isn’t dependant on the amount of light it receives to trigger its flowering stage. Instead, autoflowering cannabis plants will transition to the flowering stage when the plant reaches a certain phase of development.

Autoflowering cannabis prefers a more light, airy soil with a relatively low level of nutrients. That makes many of the soils and mixes discussed above less than ideal. That doesn’t mean you can’t use “normal” soil. It just means that you’ll get a better result with a lighter soil.

Try mixing your own autoflowering soil with the following recipe:

  • 3 parts compost
  • 3 parts peat moss
  • 2 parts wet perlite
  • 1 part wet vermiculite

For those of you using regular, photoperiod marijuana seeds, the next two sections will be your definitive guide to making the best soil for cannabis.

How To Make Your Own Organic Super Soil

To make your own organic super soil, you need to be able to control things like temperature, airflow, and carbon-to-nitrogen ratio. Check out Honest Marijuana’s How To Grow Marijuana: The Ultimate Organic Guide for advice on these variables. Once you’ve got all that straight, here’s a step-by-step guide to making your own soil.

  1. Mark out a three-by-three square on the ground.
  2. Lay down a four-inch layer of carbon material like dry leaves or straw so that it covers that three-by-three square.
  3. Add a four-inch layer of nitrogen material like livestock manure or coffee grounds.
  4. Top that with a half-inch layer of blood or bone meal.
  5. Repeat the first three steps—layer by layer—until your pile is three feet high.
  6. Leave the pile to decompose.
  7. Turn the pile at least once a week, but not more than every three days.
  8. The composting process is complete when the soil is soft, crumbly, dark black, and smells sweet.

You can use that soil for planting your cannabis seeds and for mixing your own 420 fertilizer.

How To Use That Soil To Make 420 Fertilizer

This 420 fertilizer can be used throughout the grow process to keep your cannabis plant happy and healthy. Here’s the recipe.

  1. Lay down a large tarp or purchase a plastic kiddy pool. We like the kiddy pool because it makes mixing and corralling the fertilizer easier.
  2. Spread a one-inch layer of your organic super soil.
  3. Mix in a scoop each of coco fiber and mycorrhizae .
  4. Toss in:
    a. 0.75 kilograms of rock phosphate
    b. ⅛ cup of Epsom salts
    c. ¼ cup of Azomite (trace elements)
    d. ½ cup of sweet lime (dolomite)
    e. 1 tablespoon of powdered humic acid
  5. Add another one-inch layer of super soil
  6. Spread on 1 kilogram of bat guano.
  7. Add another one-inch layer of super soil.
  8. Spread on 1 kilogram of blood meal.
  9. Add another one-inch layer of super soil.
  10. Spread on 1 kilogram of steamed bone meal.
  11. Add another one-inch layer of super soil.
  12. Mix everything together with a shovel.
  13. Fill a garbage can (or garbage cans) about ¾ full with this new mixture.
  14. Pour 2.5 gallons of water in each can.
  15. Leave this to steep in the sun for one month.

After thirty days, you can use this liquid to fertilize your growing pot plants.

Some Tips We’ve Learned Along The Way

Here are a few other essential tips we’ve learned along the way to make creating the best soil for cannabis just a bit easier.

  1. Collect all the ingredients before you begin.
  2. Take it slow. There’s no need to rush.
  3. Start recording everything you do (in regard to the soil) so you can figure out how to improve the process.
  4. Learn how to use and read a pH tester.
  5. Get friendly (not too friendly!) with the folks at your local garden center or greenhouse. They can provide a wealth of information about all things soil.

After that, just dive in and get your hands dirty. That’s the only way you’re going to learn. Happy growing!

For more information on all things cannabis and to check out our 100-percent all-natural marijuana products, visit HonestMarijuana.com today.

Best Soil For Growing Weed Indoors

If you have an indoor cannabis grow set-up, you need the best soil for growing weed indoors. Our cannabis soil guide dives deep into the factors to consider when shopping for soil for pot plants including its drainage, water retention, and texture.

In addition, we list our favorite potting soil products for cannabis, so you can grow big and bountiful yields time after time.

Choosing the Best Soil for Indoor Cannabis Gardens

When shopping for the best potting soil for cannabis, there are few factors to consider. First, how many plants are you intending to grow? This will help determine the amount of soil you will need.

Above all, you want soil with plenty of nutrients, proper drainage, and good water retention. Here are some factors to consider when buying the best potting soil for weed.


The best soil for growing weed indoors includes an optimum mixture of silt, sand, and clay soil, known as loamy soil. Ideally, the mix should have about 40% silt, 20% sand, and 40% clay.

Make sure your plants get a loose and light soil texture to help with root growth and ensure oxygen gets to your roots.


Cannabis potting soil requires proper soil drainage. When watered, the soil should not hold the water too much to where it pools on the top. If you have bad drainage, your plants can be vulnerable to root rot and mold.

Water Retention

While you want soil with proper drainage, you also don’t want the water to completely flush through without allowing the roots to take in water and nutrients.

Water retention refers to your soils ability to hold water. The best soil for growing pot indoors has balanced drainage and water retention properties.

PH refers to how alkaline or acidic solution is. Cannabis thrives in a soil pH range between 5.5 and 6.5. Deviating slightly from this range won’t cause too much damage but if it goes well beyond the range, you can get stunted growth, lower yields, and dead plants.


Nutrients are your cannabis plants life force. Most ready-to-use and organic soil mix for weed is packed with nutrients for your cannabis.

Keep in mind, the nutrients in your soil mix don’t last forever. At most, they can last a few weeks and require you to keep a close eye on any nutritional deficiencies or signs of overfeeding.

Best Soil for Growing Weed Indoors

1. FoxFarm Happy Frog Potting Soil

FoxFarm’s Happy Frog Potting Soil is ready-to-use for indoor and outdoor applications. Happy Frog potting soil features soil microbes such as mycorrhizae and humic acid to improve root growth and nutrient uptake.

Other goodies include bat guano, aged forest products, and earthworm castings. Keep in mind, this soil is designed for container planting.

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2. FoxFarm Ocean Forest Potting Soil

FoxFarm’s Ocean Forest Potting Soil features a robust blend of ingredients from the “earth and sea.” Its powerful ingredients include fish emulsion, aged forest products, earthworm castings, crab meal, and sphagnum peat moss.

Its sandy loam, aged forest products, and sphagnum peat moss give this soil a properly aerated texture that is sure to improve nutrient uptake. This soil is also designed for container use.

3. Super Soil Organic Concentrate

From Nature’s Living Soil, the Super Soil Original Organic Concentrate comes in a 1, 5, or 10 lb. bag. All you need to do is add your preferred organic potting media to complete your mix. It contains all organic ingredients that your plant will need to thrive.

Full of helpful microorganisms and fungi, this concentrate can produce the best-looking and tasting buds around. Ingredients include organic earthworm castings, bat guano, blood meal, bone meal, azomite, epsom salt, coconut water powder, kelp meal, alfalfa meal, and so much more.

4. FoxFarm Coco Loco Potting Mix

FoxFarm’s Bush Doctor Coco Loco is a coconut coir potting mix meant to recreate the tropical jungle floor. Light and airy, it does this by incorporating layers of exotic coconut palm humus which can hold more than its weight in water while still retaining great drainage characteristics.

Its ability to hold onto water will mean you wont need to water your garden as often. Water every few days for best results.

5. Big Rootz All-Purpose Potting Soil

Big Rootz’s All-Purpose Potting Soil features a professional-grade composition at a budget-friendly price. This cheap soil for growing weed is meant for indoors or outdoor gardens and has been Certified Green Clean (CGC).

A team of weed growers developed this high-quality formula that combines rapid-release amendments with medium and slow release for an optimal performance.

6. Roots Organics Rod Original Potting Soil

Roots Organics Original Potting Soil is ready-to-use for your indoor garden. Its formula is perfectly designed for aeration and water retention so you can feed your plants frequently for fast growth.

Plus, the soil bags can be used as pots. Simply cut off the top, add in your plant, and you’re set. Ingredients include coco fiber, perlite, peat moss, pumice, composted forest material, bat guano, worm castings, fish bone meal, and much more.

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