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How to Plant Cannabis Seeds Indoors

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Growing cannabis at home can be a fun project and a nice way to have your own cannabis plants on hand. You may want to grow cannabis indoors due to inclement weather in your area or due to a lack of green space in your yard. Start by germinating the seeds. Then, plant the seeds in soil or in a starter cube. Once the seeds have been planted, care for them properly so they grow and thrive.

  • After 12 hours, place the viable seeds on a towel.

Wet one paper towel and put it on a plate. Paper towels are thick enough to retain the moisture needed to help the seeds germinate. Place one paper towel under running water until it is wet to the touch, but not dripping wet. Use a ceramic dish or plate, as it will be strong enough to hold the towels and the seeds. The paper towel should cover the dish or plate. [2] X Research source

  • If you do not have enough space on one plate for all your seeds, soak two more paper towels and put the remainder on a new plate covered in a wet paper towel.

Wet other paper towel and place it over the seeds. Make sure the wet towel makes contact with the seeds. [4] X Research source

  • You can try using a heat lamp near the seeds to keep them warm. Do not warm the seeds up too much, as you do not want your heat source to dry out the paper towels.
  • If the seeds become too dry, they could die and never germinate.
  • Be very careful with the seeds as they open. Avoid prodding, pulling, or touching the seeds, as you do not want to damage the roots.
  • Any seeds that have not opened and grown roots within a few days should be discarded, as they are not viable.
  • As an alternative to soil, you can use starter cubes from your local nursery or online. Starter cubes are pre-cut growing pods made of composted bark. They contain a hole where you can place the cannabis seeds and grow them in good conditions. Basic starter cubes are inexpensive and easy to use. [9] X Research source
  • If you make planting holes that are too shallow, the seed’s roots will not have enough soil to grow well. If you make the planting holes too deep, the seed will have a difficult time sprouting.
  • Do not pull or tug at the seeds when you pick them up with tweezers. If they are stuck to the paper towel, wet the towel with water to make the seeds easier to pick up.
  • Do not press hard on the seeds when you cover them, as this can disturb their growth.
  • If you are using starter cubes, pinch the top of the holes in the cubes closed.
  • Maintain a growing temperature of 75 to 85 °F (24 to 29 °C) for the plants so they thrive.
  • Stick to a regular watering schedule so the plants get enough moisture. You can plan to spray the plants in the morning and then again at night so they get the water they need.
  • Grow lights range from $200 to $1,200 USD depending on the size and model.
  • You can get cool white grow lights at your local hardware store or online.

Avoid touching or handling the seeds as they grow. Touching or handling the seeds can damage them and stunt their growth. With the right growing conditions and care, your seeds should sprout and poke out of the soil within five to ten days. [15] X Research source

More than 12 hours of light a day for about 4-6 weeks as the plant matures will be enough. Once the plant is a decent size, you may induce flowering. Switch the plant to a timer of EXACTLY 12 hours of strong light (the more sunlight the plant gets, the more energy it can devote to flowering).

Yes, it is bad for the plant to have water constantly sitting at the bottom of the pot. It could make the roots rot over time.

You can actually find LED lamps made for growing plants online. If you don’t want to bother with that, you can just get a purple light to grow them under. There are many articles online talking about the effects of colored lights on plants.

If you plan on growing short, fat plants, they should be at least 6′ apart. You don’t want the plants rubbing on each other or shading the other plants. You will also want to select a spot to ensure all plants will receive maximum sunlight.

You can start as soon as you see two little leaves budding. During that time, make sure to use distilled water when watering them.

Cannabis thrives in a comfortable room temperature when grown indoors, or a little warmer – not too dry, not too humid. If it feels too hot or too cold for you, it’s probably too hot or too cold for your cannabis plants.

You can’t. You can try keeping it by a window, but you still won’t have much success. Lights aren’t that expensive, look on Amazon.

Yes, rain water is fine for any plant. The use of distilled water is to keep from adding tap water contaminants.

Keeping the plant from “stretching” is simple. Place the lights closer to the top of the plants. There are good video examples on YouTube showing two seeds started at the same time and placed under lights at different heights. The plant with inadequate lighting actually “reaches” for the light, growing tall and thin with longer internodal gaps. The seedling with closer light grows short and squat, with less stem between leaves (internodal distance), which means a better frame and plant structure for supporting the massive buds that you want to grow. As the plant grows, raise the lights with it. (Most folks suggest somewhere in the 16-30 inch range from source to canopy.)

The cultivation of cannabis is considered illegal in many jurisdictions. Make sure it is legal to grow cannabis in your area.

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  1. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  2. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  3. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  4. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  5. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  6. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  7. ↑https://www.leafly.com/news/cannabis-101/how-to-germinate-cannabis-seeds
  8. ↑https://www.leafly.com/news/cannabis-101/how-to-germinate-cannabis-seeds
  9. ↑https://howtogrowmarijuana.com/marijuana-seed-germination/
  1. ↑https://www.leafly.com/news/cannabis-101/how-to-germinate-cannabis-seeds
  2. ↑https://www.leafly.com/news/cannabis-101/how-to-germinate-cannabis-seeds
  3. ↑https://www.theweedblog.com/how-to-create-strong-marijuana-plants/
  4. ↑https://www.theweedblog.com/how-to-create-strong-marijuana-plants/
  5. ↑https://www.theweedblog.com/how-to-create-strong-marijuana-plants/
  6. ↑https://www.theweedblog.com/how-to-create-strong-marijuana-plants/

About This Article

This article was co-authored by wikiHow Staff. Our trained team of editors and researchers validate articles for accuracy and comprehensiveness. wikiHow’s Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. This article has been viewed 1,323,730 times.

To plant cannabis seeds indoors, first soak the seeds in lukewarm tap water for 12 hours. Discard any seeds that float to the top. Then, place the seeds on a damp paper towel on a plate with 1 inch (2.5 cm) of space between each seed. Cover the seeds with another damp paper towel. Keep the seeds in a spot that remains between 70-80°F (21-27°C), and spray the paper towels with water whenever they start to dry out. The seeds will sprout in 2-3 days. When they do, fill pots or a growing tray 3/4 of the way with loose potting soil that has a pH between 5.8 and 6.3. Press the soil down lightly, leaving some air in it. Then, use a pencil to poke 1 inch (2.5 cm) holes in the soil. Place the sprouted seeds vertically in the holes and fill the holes with potting soil. Water the soil thoroughly and place the pots or tray in a spot that’s always 75°F (24°C) or warmer. Set up a grow light over the seeds and leave it on at all times. Water the seeds every day so the soil doesn’t dry out. The seedlings will emerge in 2-4 weeks. To learn how to use cool white grow lights to help your cannabis seeds grow, keep reading!

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How to germinate cannabis seeds

So, you’ve decided to grow your own cannabis plants. You purchased a pack of seeds, assembled cultivation materials, cleared a space in your garden, and are ready to grow your first cannabis crop . With everything in hand, it’s time to begin the very first step of cannabis cultivation : germinating seeds.

What is germination?

Germination is the first stage of the cannabis growth cycle : the process that brings a cannabis seed out of its hibernation period and starts the cannabis growth process. After all, seeds in a bag don’t spontaneously start developing roots. Also known as “popping” seeds, seed germination begins when a seed receives environmental cues letting it know the setting is perfect to start growth.

Germination is the process that brings a cannabis seed out of its hibernation period and starts the cannabis growth process. Photo by: Gina Coleman/Weedmaps

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When a seed enters an environment with enough moisture, it will increase in size and slowly break out of its shell. A seedling or germ forms from which roots will emerge, helping the baby plant absorb nutrients from the soil. Seeds naturally develop roots facing down and stems stretching upward, allowing the young cannabis plant to simultaneously feed off light and earth.

It’s essential to acquire high-quality cannabis seeds for germination, as these will go on to become high-quality cannabis plants. Seeds that are fresh-feeling or too green indicate that they haven’t reached full maturity, while pale-green, white, or very dark cannabis seeds may have trouble sprouting. However, it’s tricky to know the outcome of a popped seed, so trying may be worthwhile. If you’re not ready to pop your seeds yet, store them in a dark, cool place until it’s time for germination.

Preparing to germinate cannabis seeds

Germination itself is a crucial aspect of cannabis cultivation. The seed germination process is the foundation of every marijuana plant, and steps can be taken to boost successful popping. For example, some cultivators improve germination attempts by soaking seeds in 1% hydrogen peroxide or a compost tea for 12 hours beforehand to kill any dangerous pests.

The environment in which seeds germinate also plays a role in the outcome. While there are several different germination methods, each requires proper moisture, minimal handling, and warm springtime temperatures between 68-72 degrees Fahrenheit.

How to germinate cannabis seeds

The best germination method depends on the cultivator’s choice. Here are some of the most common ways to pop your cannabis seeds.

How to germinate seeds in soil

Soil is an easy, more natural method with which to germinate your cannabis seeds. The soil protects the fragile roots from any interference, and soil is, after all, where a cannabis plant would grow in the wild.

Soil is an easy, more natural method with which to germinate your cannabis seeds because the soil protects the fragile roots from any interference. Photo by: Gina Coleman/Weedmaps

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First, make sure you use the correct type of soil, either gently fertilized potting soil or a seed starter with a pH level of approximately six (6). The soil contains the right acidity and enough nutrients to strengthen your young cannabis plants for the first two weeks. Be careful not to add more nutrients, or you risk overfeeding and killing your seeds.

Place the soil in a small pot and use your finger or a pencil to push a small hole in the dirt, a bit more than half an inch deep. Insert the seed into the hole and bury it with soil. From this point on, don’t touch your seed. The young plant is fragile and knows how to position itself in the soil bed.

Gently water the soil with a spray bottle and situate your pots under a fluorescent lamp. Keep seeds away from the windowsill, as the temperature is too volatile for germination. In general, you’ll want to keep the temperature in the range of 70 to 80 degrees Fahrenheit.

Monitor your soil every day and keep it moist. Within four to seven days, you should see tiny stems sprouting from the soil.

When the seedling stems reach two to four inches in height, it’s time to transplant your cannabis into larger pots with more room for roots to spread down and out. After you’ve done this, you’ve successfully germinated your cannabis seeds into proper, young plants.

How to germinate seeds in water

You can also germinate your seeds by placing them in water. It’s slightly faster than the soil method, but you need to adjust your environmental factors accordingly. Remember, successfully germinating seeds requires a perfect balance of ideal growing conditions. When germinating in water, seeds need only 24-48 hours to pop their stems, though cultivators can keep them soaking for up to a week as needed. Water germination is faster because the seed gets all the moisture it needs immediately, and the shell softens and cracks more easily after soaking.

To employ water germination, fill a glass with tap water and let it sit until it reaches room temperature or around 65 degrees Fahrenheit. Add two to three plant seeds per cup and allow them to sit, watching for any changes. Change the water to fresh tap water every two days, making sure it stays at room temperature.

The seeds should start sprouting in about two days, though older seeds can take up to a week to sprout. You can remove them from the water and place them in the soil at any point once they’ve sprouted. Once the roots are about five millimeters long, they need to be planted.

The downside of water germination is that once they’ve popped, you’ll need to maneuver them into their growing medium manually. This is a delicate process, as germinating seeds are extra fragile, and any harm risks the development of your plants. Make sure to place the seed roots down in the soil when you transfer to a pot.

How to germinate seeds using paper towels

The paper towel method is also a common way cultivators pop their seeds. Some even use this method with cotton pads instead of paper towels, but the necessary steps are the same.

To germinate seeds this way, lay one paper towel on top of a countertop, place a few seeds, and cover them with a second paper towel.

Lay one paper towel on top of a countertop, place a few seeds, and cover them with a second paper towel. Photo by: Gina Coleman/Weedmaps

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Use a spray bottle to moisten the paper towels and then store the cushioned seeds between two plates, under a face-down bowl, or gently place them in a plastic bag. Maintain a temperature of about 72 degrees Fahrenheit, keeping the paper towel wrapped seeds in the dark and away from a windowsill. In two to five days, the seeds will pop inside the paper towel sandwich and emit tiny roots, ready to plant when they reach about five millimeters in length.

Use a spray bottle to moisten the paper towels and then store the cushioned seeds between two plates, under a face-down bowl, or gently place them in a plastic bag. Photo by: Gina Coleman/Weedmaps

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The paper towel method also has its risk, as the fragile seedlings can be damaged during the potting process. The tiny roots can also get tangled in the paper towels, so make sure to move the seeds to potting soil before roots grow too long. Use your hands or tweezers to gently remove each seed from the paper towels and place them in a prepared growing medium.

How do you germinate seeds indoors?

Whether you’re planning an indoor cultivation or outdoor grow, it’s best to germinate your seeds indoors. It’s easier to maintain proper temperature, light exposure, and moisture inside, and you can protect your seeds from the elements. Indoor germination, whether using soil or paper towels, will ensure your cannabis seeds have the best chance for survival.

To germinate seeds indoors, use any of the methods described above. Within a few days, you’ll have popped seeds ready to transfer to a growing medium.

Do you need to germinate seeds before planting?

While many plants can be germinated in the ground, cannabis seeds are fragile enough that you should germinate them before planting.

Once your seeds have sprouted roots, they should be planted in soil, a soil-less medium, or in your hydroponic setup. Make sure not touch the root, caring for and navigating the seedling so that the roots face downward. Plant the seed about one inch deep in your growing medium, cover lightly, and allow for about a week for the seed to emerge from the soil. If the seed hasn’t poked through by day ten, it likely didn’t survive.

How Deep Do I Plant Pot Seeds?

First-time cannabis growers have a plethora of questions when it comes to the first phases of marijuana cultivation. Even though growing marijuana plants is not much different from growing other plants (since every plant needs soil, light, nutrients, and water in order to thrive), the difference is in how much of these factors the cannabis plant needs.

In order to end up with a good Sativa, Indica, or hybrid marijuana strain, growers need to take into consideration the unique requirements that each strain needs.

To help you become more confident and informed when you set out to start marijuana cultivation, we’ll get into the subject of germination and planting of cannabis seeds, providing you with everything you need to know in order to grow Marijuana.

Tips Before You Start With the Germination of Marijuana Seeds

There are a few things you’ll need before you begin germinating seeds:

  • Get high-quality seeds from a reputable seed bank.
  • Keep your marijuana seeds under a specific temperature for germination that should be about 72 degrees Fahrenheit (22 °C).
  • Keep your germinating seeds away from direct sunlight (don’t keep them on your windowsill or near a heater since they will get dry, and seeds need moisture).
  • For the germination stage, you’ll need jiffy pellets or starter plugs that are designed specifically for germinating weed seeds.
  • For indoor cultivation, you’ll need grow lights that will be used after you plant the cannabis seeds in pots.

Guide for Planting Cannabis Seeds

In order for the marijuana cultivation process to result in a harvest, the marijuana plant needs to go through 4 stages: germination (3-10 days), seedling (2-3 weeks), vegetative stage (3-16 weeks), and flowering (8-11 weeks). The first and second stages are the most crucial when it comes to planting pot seeds.

Germinating (Sprouting)

The first stage (germination) begins when the dry cannabis seed is placed in water until it sprouts. Some seeds may germinate, while others may not, depending on the quality of the seeds. Good cannabis seeds should be brown in color and should feel hard and dry to the touch.

Transplanting (Planting the Seed)

Once your seed has sprouted, it’s ready to be placed in soil so that it can start growing. Its taproot will grow downwards, while the stem grows upwards. As the plant grows, two cotyledon leaves grow out of the stem these take in sunlight to help the plant grow healthy and stable.

Germination: The Wet Paper Towel Method

This germination method includes germinating your seeds with damp paper towels and has been a tried-and-tested method for germinating seeds. Two pieces of paper towels are soaked in tap water and the seeds are stored between the sheets. Additional water is added over the next few days to keep the seeds moist.

Sprouting times tend to vary, but the seeds will generally take between two and four days to sprout, and if they take longer it’s best to throw them away, as they probably aren’t viable. After a few days, tiny roots should appear, and that is an indication that the seed is ready for planting.

Germination: Soaking Seeds in Water

Another method for germinating cannabis seeds that works well with harder seeds is the soaking method. This method requires you to place the seeds at room temperature tap water and keep them soaked for 32 hours.

After you’ve put the seeds in water, some of them will sink to the bottom. These seeds are viable. The non-viable seeds will float, and they need to be thrown away. After 32 hours, you can use the paper towel method on the seeds that sank, and after they sprout, you can plant them.

Planting the Seeds Directly

This is a harder germinating technique and one that isn’t recommended for first-time growers. In order for it to work, growers need to be informed about the plants’ required nutrients, humidity levels, and the appropriate pH soil levels that are needed.

For this type of seed germination, you’ll need to plant the marijuana seeds in moist soil, about an inch deep. You’ll also need to have some additional heating system to keep the plants warm for the first few days. Even though planting the seeds directly may not be the best option for novice growers, it does have its benefits, like not risking breaking the taproot off when you’re transferring the plant to another pot.

Transplantation of Germinated Marijuana Seeds

After germination, you can plant the germinated seeds in a pot. Remember that the cannabis seedlings and its taproots are fragile in this early stage and you need to handle them with care, so it might be good to use tweezers when you do this.

Fill small pots (2 inches) with potting soil that is loose and moist to the touch. The pots should be filled ¾ of the way. Make half-inch pre-drilled holes by using your finger, and carefully place one sprouted seed in each hole.

Cover the seed with soil, spray it with water, and refrain from pressing the soil. It will take about one more week for the germination process to conclude, after which a stem will surface, and the taproot will produce secondary roots.

The best soil for sprouting cannabis seeds is a seed starter with only a little bit of fertilizer, as cannabis seedlings need loose soil in order to grow easily. For hydroponic cultivation, you may want to germinate in rockwool cubes because they retain moisture better.

Replanting for Healthy Growth

Young plants need to be planted in smaller pots before they’re replanted into bigger containers, so that they can grow a stronger root system. That’s because small plants that are planted in bigger pots may find it harder to get oxygen when they’re surrounded with too much growing medium, which can result in stunted growth.

It’s best to replant your cannabis plant as it outgrows its pot. Avoid leaving your plant in a small pot for too long as that can result in you having a “root-bound” plant (the roots grow too large for the pot and the plant can asphyxiate and die.)

Some growers will directly plant the seedlings in the final container. However, this is not recommended because it will be harder for the plant to get oxygen when it is surrounded by too much growing medium. On the other hand, if you find that your plant absorbs water within a day, it might be time for a bigger pot.

If the thought of transplanting your weed seeds sounds tiresome and challenging for you, then you can always plant directly in the final container. But do expect slightly slower growth, and make sure you are careful when watering the plant so as not to give it too much water.

Conclusion

Cannabis plants require specific conditions in order to thrive and produce a good harvest. However, taking care of marijuana seeds isn’t as hard as you may initially think. Planting these seeds is similar to planting any other seeds when you’re gardening fruits and vegetables. All you need to know is how to properly germinate and transplant your young plants. With a bit of knowledge and practice, you’ll be well on your way to becoming a seasoned cannabis grower.