When Growing Weed Indoors:
From Seedling to Flowering
How do you care for your plants through their different stages of growth? Cannabis plants will go through a seedling, vegetative, and flowering stage. Each stage is unique, so it is crucial to understand each part of the growth cycle to produce healthy plants.
Your cannabis seeds have successfully sprouted, time to be planted in your chosen medium. Just a few millimeters below the surface of your medium. Your little plant babies are delicate and easily damaged. So handle them with care. Plant them with the roots facing downwards as an easy way to give them stability.
The Seedling Stage
In this stage, cannabis in the seedling stage does not require intense lighting setup. Compact fluorescent lights or LEDs will work. The optimal light cycle for seedlings is 18 hours on and six hours off.
Remember seedlings are tiny and fragile, so you should water them accordingly. Major Rookie move is overwatering your seedlings that can wreak havoc on your whole operation. The temperature of the room you have set up to grow stays between 68 and 77 degrees known as the sweet spot. Important at this stage is humidity and some growers may use humidity domes to keep the seedlings in their comfort zone.
Seedlings may be managed in small containers later transplant them to their permanent container during the vegetative stage is common. This stage normally last about two to three weeks.
This stage is where growing gets exciting. The vegetative stage is when the plants have developed strong roots and leaves. If you are transplanting them into their bigger containers be careful. In this stage you will see rapid growth.
In this plant growth cycle you may see a series where new leaves pop up frequently, usually stopping at around 10 leaves. Branches may even start to develop, and expand in new directions. Space your plants according to their expected growth depending on if you choose indica, sativa, or hybrid. The vegetative stage, is where you can begin to train your plants by pinching or topping them, which typically ends up increasing your yields.
The more sunlight your plants have they will stay in the vegetative stage longer. Growing indoors allows you complete control on how long they stay in this stage. If you want them to stay in the vegetative stage and not flower, you can keep them in the same light cycle as the seedling stage (18 hours on, six hours off). If space is an issue, be careful how long you keep your plants in the vegetative stage. The longer they are kept without flowering, the larger the plants will become. Typically plants stay in this stage from three to 16 weeks.
Keep the Males Away
Very Important stage when moving to the flowering stage, be sure to determine if you have any male plants in the mix. If you do; you’ll want to throw them out because they will try to pollinate your plants, forcing the females to produce seeds. You’re trying to get them to flower, not go to seed.
Female plants have pointy green calyxes, tear-shaped flowers that grow little white pistils.
Males will not have this characteristic and instead will have small pockets filled with pollen.
Make sure you separate any males from your bunch before the pockets of pollen burst.
Feminized cannabis seeds should be used if you don’t want to deal with separating the male plants out.
If you have made it this far pat yourself on the back. The final stage begins in flowering when you cut back on the light, reducing it to around 10-12 hours per day. When you adjust the light, plants will sometimes have a growth spurt as they anticipate the coming of winter. Be sure to have enough space.
When your plants begin to develop resiny buds. It is going to require more nutrients. It’s important to not abruptly make changes to your schedule, but instead, ease from using growing to flowering nutrients over the course of a week or so.
Normally around the third or fourth week of flowering, your plants will stop growing altogether. Now they can focus all of their energy on making dense, aromatic buds loaded with trichomes.
Harvest time will vary, but somewhere between week six and eight is a good time to prepare. Determining harvest time by looking at the pistils and trichomes on your plants.
(Don’t rely on number of weeks to know when you should harvest, too many factors are at play). The pistils, or tiny hairs, should change from white to yellow until they are finally brown. This will vary slightly depending on the strain you are growing. A heavily-magnified item such as a jeweler’s loupe can be used to zoom in to the tiny appendages of your trichomes. The color is extremely important!
Clear trichomes mean the plant is not ready.
Milky means they are at peak THC levels.
Amber means they are beginning to decrease in THC levels.
Tips For Successful Indoor Growth
Follow directions as labeled on your nutrients and check for specific variations in growth for the strain you plan to harvest. Don’t prune your plants after a few weeks into the flowering stage as it can throw off their hormonal processes. It’s important to stick to your light regimen precisely, as exposing your plants to light during their typical cycle of darkness can mess up the flowering stage. If you can’t stop yourself from peeking at your plants during their “night”, you’re going to hurt your yield.
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Understanding the light cycle for weed plants
Unless you’re a beginner, you should be familiar with the light cycle for weed. It’s an essential part of cultivating cannabis. Few people are aware of the important role it plays in the plant’s growth.
Marijuana plants that grow outdoors usually take the cue from seasonal changes to begin budding—unless they’re autoflowering of course. Towards the end of summer, when there are more hours of darkness than sunlight, weed plants enter the flowering phase.
Indoor cultivators use this knowledge to manipulate light cycles to create an environment where they can control how their crop responds to the stimuli.
The light cycle for weed can be a complex topic. We’ll help you understand lighting and how it affects your plant’s development. We’ll also look into the different types of schedules, and how to use it effectively during each stage of the growth process.
A guide to the light cycle for weed
Although the term used is “light cycles”—it’s the length of darkness that determines when your marijuana plants move from the vegetative to flowering stage.
We’ll break it down into the following three growth phases:
Weed light schedule for seedlings
You can cultivate outdoors if you live in a warm area. Keep in mind that marijuana plants need humidity during the seedling phase.
If the climate is not suitable, start your plants indoors and move them outside when the time is right.
The inside seedling stage
At the cannabis seedling stage, you don’t require any extensive lighting setup. You can use compact fluorescent or LED bulbs. The optimal light schedule for seedlings is 18 hours of light and six hours of darkness.
The outside seedling stage
If your seedlings don’t get enough sunlight, you can use artificial lighting to extend the light period to 18 hours.
Cannabis vegetative lighting cycle
During the weed vegetative stage, your plant grows stems and leaves. During this phase, it focuses its energy on growing big and strong.
Based on the cannabis light cycle, your crop will remain in the vegetative phase until it receives 12 hours of uninterrupted darkness—then it’ll begin to flower and produce buds.
The inside vegetative stage
When growing indoors, you’re not dependent on sunlight and can control the marijuana light schedule. You can allow your plant to grow as big and tall as you want by giving it at least 18 hours of light every day.
Some cultivators increase the light to 24 hours per day, but we don’t recommend this because it can cause your plant to develop too quickly.
The outside vegetative stage
The marijuana light cycle for outdoor weed plants depends on the hours of sunlight in the day. Position your plant where it gets the most light.
Most growers prefer to keep their plants indoors under 18–24 hours of light before moving them outside for vegging. If you do this, make sure the outdoor conditions are suitable before the move. Snow or a sudden temperature drop can kill your crop overnight.
Marijuana flowering light cycle
Similar to the seedling and vegetative stages of the growth process, there’s a light cycle for flowering cannabis. When marijuana plants receive more hours of darkness, they start to flower or produce buds.
The inside flowering stage
If you’re cultivating indoors, mimic the change in seasons to switch your plant to flowering.
By adjusting the light cycle for weed to 12/12 hours of light and darkness, your plant should start producing buds for the next 8–12 weeks depending on the type of strain.
The outside flowering stage
You can expect the same flowering response once fall approaches when growing outdoors. In late June, the days are shorter and it’s dark for longer according to nature’s light cycle. You’ll see beautiful buds on your plant soon.
Light cycles for autoflowering plants
Autoflowering cultivars start flowering when they reach a certain age, so you don’t need to manipulate light cycles for your plant to begin flowering.
If you want to generate the best possible yield, providing your crop with optimal lighting conditions is a step in the right direction. They don’t depend on light changes to start blooming though.
Autos typically grow smaller than photoperiod strains because they spend less time in the vegetative phase. You’ll stimulate its robust growth by implementing a cannabis light cycle with a minimum of 18 hours of light.
Some cultivators achieve excellent results when they use a 24 hour light schedule. There’s no hard and fast rule to stick to. We suggest trying them out to see what works best for you.
If you want to save energy costs, a 12/12 marijuana light cycle offers a decent yield. The buds will be smaller than what you’d harvest when using the 18/6 and 24/0 schedules.
Light cycle scheduling provides a higher yield
The marijuana harvesting stage is probably the most anticipated and satisfying part of growing weed. Light cycles are vital to your growing success. You can expect awesome yields if you’ve got the lighting down and you’ve properly fed and watered your plants.
The two stages in your plant’s growth that require optimal lighting are:
During the vegetative phase, your plant will grow big and tall. Manipulating the weed light cycle can affect its size.
If you want a huge plant, use the 24/0 schedule. Otherwise, a minimum of 18 hours of light will suffice.
To force your plant into flowering, switch the marijuana lighting schedule to 12/12. Switch to an 18/6 or 24/0 schedule to increase the size of your buds once flowering has started.
Is it possible to provide your plants with excessive light?
Although you can manage and manipulate weed light cycles, it’s possible to over expose your plants to light. It usually happens when you position your grow lights too close to them.
Even the best grow lights for cannabis can be detrimental to your plant’s health if placed incorrectly. Excessive heat can burn the leaves of your herb. The most obvious sign is leaves that are yellowish and appear burnt.
Switching spectra: is it really necessary?
Yes. Switching spectra plays a big role in mimicking natural lighting.
When using marijuana light cycles, you should consider spectrum colors. Different hues play unique roles in your weed plant’s growth, so you should switch colors during specific developmental stages.
The red spectrum is essential during your crop’s flowering stage because it gets the budding process going.
- Vegetative stage: bluer than red light.
- Flowering stage: redder than blue light.
Light disruption and power outages
Even if you use the best LED grow lights, there may be occasions when the light cycle for your weed is disrupted. Power outages are the most common culprits.
There’s no cause for concern as you can help your plants stick to a schedule by giving it some natural light during the “bright” period of the day.
If you live in an area where these light disruptions are frequent, we suggest looking at long-term solutions such as a backup power source.
FAQ related to light cycle for weed
We’ve rounded up some of the most common questions and answers about the light cycle for weed.
Is 24 hour light good for weed plants?
No, it’s not good for plants in the vegetative and flowering stages. A 24-hour light schedule for weed forces your plant to grow faster. Seedlings, on the other hand, need between 16–24 hours of light to stretch.
How do you switch to a 12/12 light cycle?
To switch to a 12/12 schedule, keep your grow lights on for 12 hours and off for the next 12 to give your plant an equal amount of light and darkness every day.
If you want to send a clear message to your herb that it’s flowering season, turn the lights off for 36 consecutive hours. After this period is over you can start the 12/12 cycle. This method kickstarts the flowering phase.
Can I change the light cycle during flowering?
Yes, once your plant starts budding during the 12/12 light cycle, you can switch to a different schedule. You’ll likely get bigger buds than if you stick to the 12/12 one.
Can a weed plant get too much light?
Excess light and intense heat can hurt your plant instead of helping it thrive. Your marijuana lighting schedule should mimic the natural light level of the sun’s rays as closely as possible when cultivating indoors.
Optimize light cycles to maximize yields
The light cycle for weed is an essential element in a marijuana plant’s growth and development. If you mimic nature’s lighting conditions in your indoor growing area, your cannabis plant will thrive and give you a bountiful harvest. The vital point to remember about light cycles is that it’s the dark period that determines when your plant starts to flower. Switch to a 12/12 schedule when you want the budding process to begin or simplify your life and grab some autoflowering seeds.
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