Cannabis Seedling Light Schedule you should Follow [Must Read]

isolate because the dust of male plants could hurt female plants!

Weed can be cultivated in one of two ways: outside, beneath the sky, and at the mercy of the sun, or indoors, protected from the elements. For both cannabis seedlings Light Schedule is important.

When you cultivate marijuana indoors, you have far more control over the growth of your cannabis plants than when you grow it outside, which is primarily dependent on natural elements over which you have little influence, the most essential of which is light.

We’ll take a closer look at the best cannabis seedling Light Schedule in this article.

Likewise, we look at developing lights, why they are essential, and the few phases of development that a Maryjane plant goes through.

Again, these are vital ideas for producers since they can decide the best light timetable for their cannabis seedlings because of the vegetative stage and the developed light they are utilizing!

It’s critical to get your light schedule right when producing cannabis. The amount of light dramatically determines the size and quality of your crop and when it is provided to your cannabis plants.

In addition, seedling, vegetative, and blooming stages require different lighting. Every producer does things their way, and we’ve tried to collect a variety of successful marijuana light schedule implementation tactics. Let’s take a look at them!

Photoperiod Strains and Light Requirements

Cannabis is an “annual” plant, meaning it only has one growing season. Cannabis’ natural growth cycle starts as a seedling in the spring, then “veg” throughout the rest of the spring and summer before “flowering” and producing buds to reproduce the next generation.

Because of this heritage, photoperiod cannabis will “bloom” when exposed to the correct dark circumstances. Give cannabis 12 hours of uninterrupted darkness every day, and it will flower (thinking its autumn as the evenings become longer). The lighting needs for each cannabis plant’s lifecycle vegetative stage are different.

Grow Lights and Their Importance

When you grow weed outside, it gets all of its vital growth ingredients from nature (water, air, heat, and sunlight). The sun is the most crucial thing for weed development outside since it provides both warmth and light, which is essential for plant growth.

The marijuana plant uses the sun’s light to execute photosynthesis, a chemical reaction in which the plant turns sunlight into too much energy. As a result, the plant grows in the same direction as the sun.

Furthermore, sunlight aids in the metabolism of growing cannabis plants and the production of chlorophyll and other colors and compounds. In the case of marijuana, this would include THC, which is the principal component that causes you to feel ‘high’ after smoking it. So, as a result, light is crucial.

When it comes to growing lights, they’re used when you’re growing weed inside. However, growing plants indoors is preferable to growing them outdoors since it ensures that your growing cannabis plants will not be injured even if clouds obscure the sun.

However, if there is heavy rain or snow, you are supplying them with an artificial source of constant light: grow lights.

Grow lights, in essence, mimic the sun’s uninterrupted light and are thus critical for the growth of marijuana plants.

Let’s look at the many phases of marijuana plant development.

Understanding the Stages of Marijuana Plant Development

Different individuals classify the stages of slow growth in different ways. The marijuana life cycle, on the other hand, is divided into seven stages.

  • Seed

During this vegetative stage of development, the cannabis seeds are sorted. The female seed is the one that has the power to sprout (bud being the end product that you smoke). Male plants do not produce blooms and are often a hindrance to normal development.

  • Germination Phase: 

After that, the seeds are soaked and stored in a damp, warm, and dark environment until they develop tiny roots. After that, the germinated seeds are placed in the mud with the root pointing down.

  • Seedling:

This is the vegetative stage when the stalk develops upwards toward the sun, and the first leaves appear.

This highly vegetative stage requires much attention because it is the make-or-break final stage of the plant’s life cycle.

  • Encourage Faster Vegetative Growth: 

As additional leaves emerge, the marijuana plant’s height increases. The shoot begins to transform into a thicker, more rigid, sturdier stem that provides excellent support for the entire plant. This is a period of fast expansion.

  • Pre-Flower:

This is the vegetative stage right away before blossoming/sprouting when buds start to show up, and it is likewise when male plants (if any) should isolate because the dust of male plants could hurt female plants!

  • Flowering: 

The lights are muted during this flowering stage compared to the previous stages, and the flowers begin to show.

Unfortunately, this is also when gardeners must pay special attention to nutrition since the plant demands potassium and phosphorus-based nutrients. After that, pistils will appear, signaling that you are ready to harvest!

  • Reaping:

This is the vegetative weed stage where you gather the bud and drape it to dry for four to six days before smoking it!

Seedlings’ Ideal Light Schedule

Let’s take a deeper look at the too much light schedule for cannabis seedlings now that you know what phases of vigorous growth a marijuana plant goes through. Because seedlings are the most susceptible vegetative stage, they require greater attention and care from outside producers.

A plant’s growth from seedling to the vegetative stage takes a long time, and everything that goes wrong at the seedling stage will show up in the later phases – and in the worst-case scenario, it may kill the plant right there.

As a result, considerable vigilance is recommended. When it comes to cannabis light schedules, it’s important to remember that this is the seedling phase of growth that demands the most light. A marijuana plant in the flowering stage can get as long as 18 hours of light.

Therefore, the 18/6 technique, which implies 18 hours of solid light and 6 hours of continuous dimness, helps deliver these growing seedlings.

Since the plant is going from a seed to a plant during this time, it requires light. Therefore, the more energy it creates, the better it can develop further.

While new leaves are sprouting, the plant’s energy need is high. Therefore the extended period of light allows it to develop adequate chlorophyll and perform photosynthesis for more extended periods, allowing normal metabolism.

Surprisingly, some individuals prefer the 24/0 approach. They give the plant 24 hours of continuous light and 0 hours of darkness for an extended time before switching to the 18/6 seedling phase just before the plant starts the vegetative stage.

However, we strongly advise most growers (especially beginners) to stick to the 18/6 approach because the darkness is just as crucial for the plant as light, as too much light can cause the plant to wear out and stunt its growth.

Being Aware Of The Seedling Stage

Cannabis seeds contain all the genetic material needed to sprout and grow into large, lush plants inside their dark, hard shell.

In addition, cannabis seeds can absorb water from their surroundings when exposed to humidity and warmth. This is known as imbibition, and it is fundamental for all cannabis plants to make due.

When water gets into a seed, it triggers proteins that make the taproot develop (the little white root that jumps out of cannabis seeds when sprouted appropriately).

While the seed sends a shoot up and out of the earth in the journey of light, the root starts to drive further underground, looking for more water.

As of now, two cotyledons (or undeveloped leaves) exist in weed seeds, which loosen up and push the seed coat away from the stem.

Marijuana plants produce their most memorable arrangement of real leaves when the cotyledons arise. These will have one finger and will outgrow the main stem.

Marijuana seedlings get all of their energy from stores inside the seed in the beginning growth phases of their life. Therefore, they can retain water through their leaves as their underlying foundations develop.

Your plants are no longer seedlings and are formally vegging whenever they have framed their most memorable arrangements of genuine leaves (leaves with something like 5-7 fingers).

Remember that healthy seedlings have fast growth and brilliant green leaves.


We hope this article has provided you with a better understanding of the marijuana plant’s numerous growth cycles, particularly the flowering stage.

Because this is the vegetative stage when your weed plant transforms from a seed to a plant with a high energy interest, it requires the most thought and consideration and the lightest.

To sum up, the 18/6 strategy for becoming your weed is the best method. You supply 18 hours of steady light and 6 hours of constant obscurity, as it makes sufficient energy and permits the plants to rest before beginning another metabolic light cycle! We trust this data helped work on your weed’s development.

Smoke securely!


Is there such an incredible concept as an excessive amount of light?

Many individuals accept that there is no such thing as ‘an excessive amount of light’ about seedlings.
However, since you can’t blossom a pot plant without giving it a 12-hour dimness/12-hour light treatment, light becomes an issue when it moves toward the pre-blooming/flowering stage.
We accept that developing your pot plants in the flowering stage utilizing the 18/6 methodology is the ideal choice. However, twenty-four hours of light is over the top.

Is obscurity important for seedlings?

Like any remaining growth phases of the marijuana plant, Seedlings require haziness. But, be that as it may, they require a minimal measure of haziness.
While the blossoming stage requires as long as 12 hours of haziness, seedlings can make do with less (most producers favor 6 hours, yet some give 24 hours of light).
However, dark hours are essential to prevent the plant from burning out owing to excessive metabolism.

How far away from the seedlings should the light be?

Under ideal conditions, you should start with the seedling about 18″ above the soil and gradually lower it as it grows, but not so much that it turns out the plant!
Seedlings need a lot of light, but they’re also quite delicate and can burn quickly if exposed to too much.
If you’re using an LED light, we recommend keeping it around 15″-20″ away from the top of the seedling. Likewise, T5/fluorescent lights should be kept at a 6-8″. Another critical point to remember is that air circulation must be excellent during this period so that all of the heat is dispersed, but the warmth remains.

What is the most delicate sort of seedling grows light?

For the seedling stage of the marijuana plant, LED lights are the ideal type of grow light. In addition, they are the most incredible lights for growing marijuana at all stages.
This is because LED lights have a broad wavelength spectrum and are cost-effective in electricity consumption. Furthermore, they can endure up to 50,000 hours and do not heat up quickly.

For novices, what is the optimal cannabis seedling light schedule?

Sticking to a 20/4 light schedule will allow your plants to breathe in some darkness, maximize the quantity of light they receive, and give your crew a break. You can play around with different lighting schedules to see which one works best for you. Seedlings do not require much light to thrive.

Do cannabis plants require how much light to grow?

The average indoor grower gets 1,824 hours of light each day (known as 186 or 240-hour flight schedules).
Give healthy cannabis plants more daylight each day to encourage rapid growth during the flowering phase. For example, an 18/6 daylight schedule is typically when a manufacturer delivers 18 hours of light per day and 6 hours of darkness.

Vegetable seedlings require how much light?

Developing healthy and strong vegetable seedlings requires intense light. Some varieties, such as tomatoes (Lycopersicon esculentum), require just bright, indirect light, while others, such as annual tomatoes (Lycopersicon esculentum), require six to eight hours of direct sunlight.
Therefore, unless your home has enough natural light, all vegetable plants should be grown under a grow lamp.

How long should a grow light be left on?

Every day, leave the grow light on for 16 hours. It should be turned on shortly after daybreak in the morning and turned off around 4:00 p.m. Eight hours of darkness is also required for vegetable seedlings. Connecting your grow lamp to a programmable timer is a simple method to accomplish this.

How long do you leave the seed to grow light on?

Adjust the light to keep the grow space at 2 inches above the seedlings. Every day, leave the grow light on for 16 hours. It should be turned on shortly after daybreak in the morning and turned off at 4:00 p.m. Eight hours of darkness is also required for vegetable seedlings.

Do plants require how much light to grow?

Peppers and tomatoes, which require a lot of direct sunshine, should be at the top of this spectrum. However, more than ten or even 8 hours of light are sufficient for plants requiring less light.

You can easily set up a timer LED bulb to ensure your new plants get the proper amount of light every day once you’ve purchased one.

What is the expected number of hours of daylight?

It all relies on your freedom. The more daylight hours you have, the further north you go. The Gulf Coast experiences roughly 14 hours of daylight. A day takes around 16 hours and 15 minutes along the border with Canada.

How many hours of light does a day have?

To switch on your grow lights on a regular light schedule, use a simple light timer, which can be found at any hardware shop. Every day, the average plant requires 1,216 hours of light. Each day, they require at least eight hours of darkness.

How much light do seedlings require to grow?

Seedlings require 16-18 hours of artificial light per day. Place reflectors around the lamp that reflect all of the light from the tops and sides of the plants to ensure even coverage and maximum light intensity.

How much light is required to develop plants from seed?

Place them about 6 inches below the lights so that they can support candles with 900-foot light intensity. A double tube bulb can be used, but the light intensity will be lower, and the plants may not have roots develop as well. Young seedlings require 16-18 hours of artificial light per day.

How long should plants be exposed to grow lights?

Many worry about how long to illuminate plants with light when utilizing artificial flashes. The best time to light the plants is between six and sixteen hours. But, because the answer to this FAQ is dependent on several things, I’ll go through everything in detail.

What kind of light does an indoor plant require?

Seedlings require 16-18 hours of artificial light per day. Place reflectors around the lamp that reflect all of the light from the tops and sides of the plants to ensure even coverage and maximum light intensity. Cannabis plant in low- to medium-light conditions.

Plants require how much light?

Plants in the center that require roughly 1012 hours of light each day require medium exposure. Borsigiana is one of the creatures included in this group. Tomatoes, peppers, snake plants, and so on.

When planting seedlings, should you leave the home lights on?

Even if you leave the lights on all day, the light will diffuse over the room, causing your seedlings to take slower to grow due to the lack of intensity. So instead, invest in some grow lights and direct them towards your seedlings. Every day, set a timer for 12 hours of light.

To develop plants, how many hours of light do I need?

The cannabis plant can receive up to 24 hours of light every day during the short vegetative phase. However, many indoor growers use 1,824 hours of light each day (also known as the 186 or 240 light regimens) to facilitate faster vegetative growth during the vegetative phase.

What kind of light schedule should your outdoor garden growers have?

When cultivating these plants in the same store as photoperiods, most growers frequently utilize a 12/12 auto-flowering light schedule, as this is the light cycle for the latter. It’s also the program of choice for individuals on a tight budget who can’t afford the high energy expenditures of long light cycles.

What is the optimum indoor auto plant light schedule?

Most indoor growers indicate that using an 18/6 light schedule results in unprecedented growth rates (18 hours of light and 6 hours of darkness per day). Another standard automobile interior lighting scheme is 20/4.

What is a plant’s photoperiod light schedule?

Photoperiod plants require complete minimal darkness throughout the dark daylight period. This light scheme starts blooming and should be continued till harvest.

Are light schedules required for auto-flowering plants?

You don’t have to bother about light schedules when planting autoflowers outside. Ensure that your cannabis plant receives three months of warm weather (60°F) and that your climate is likely ideal for autoflowering plants.

To develop quicker, how much light do cannabis plants require?

Giving your cannabis plants additional hours of light per day encourages faster growth during the flowering phase. A common 18/6 light schedule is when a manufacturer provides 18 hours of light and 6 hours of darkness per day. A 240-light program operates around the clock.

Is it possible for a seedling to receive too much light?

Seedlings require a lot of light, yet they are delicate and can quickly burn if exposed to too much. Therefore, they propose that you keep your lights at the height of 1520 from the seedling’s top. When using a T5 LED/fluorescent lamp, you can achieve a height of around 68 inches.

Does it take sunlight for seeds to grow?

Seeds germinate primarily underground, away from direct sunshine. Therefore, the plant does not require nutrients from the soil.

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