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starting marijuana seeds under led lights

Whether you are new to growing cannabis or just new to growing with LEDs, mistakes can happen! Find out what you should avoid in order to grow top-tier cannabis under LED lights!

Feminized (photoperiod) strains, on the other hand, are typically grown under 18–24 hours of light in the vegetative stage, then under 12 hours of light and 12 hours of darkness to initiate and sustain flowering. This shouldn’t be a problem, as most growers will set their lights on a timer for this very purpose. Then again, for someone who’s just starting out, they might not feel confident tailoring different light cycles and spectrums, especially if their setup doesn’t utilise full spectrum lights. It’s certainly not impossible for beginner growers to swiftly get the hang of maintaining proper light schedules, but sometimes the new tech of LEDs can lead people to make silly mistakes. In that case, you may wonder why your plant is reaching gigantic heights, but won’t grow you any buds!

1. NOT SETTING YOUR LED LIGHTS AT THE PROPER DISTANCE

Providing your plants with enough light can become an issue if you want to grow more than one. For example, one single 300W LED light fixture may be fine for one or maybe two plants, but it may not be enough to cover a bigger space with multiple plants. So make sure to reference any recommendations from the vendor and/or LED manufacturer on how much light you will need for your growing space. You can also look for reviews and user reports on grow forums if you want to know more about using a particular LED.

This is probably the most common mistake that inexperienced growers make upon just starting out with LEDs. Since HID lights emit a lot of heat, out-of-the-loop growers might be overly cautious with their LEDs, placing them too far away; alternatively, those aware of the benefits of LEDs might get cocky and place the lights super close. If you hang your LEDs too far away, there’s a good chance your plants will over-stretch in an effort to reach closer to the light. If, on the other hand, you place your LEDs too close to your cannabis plants, this can stress the plants more than they can comfortably handle, causing burning and bleaching of the foliage and buds.

Most LED grow lights you can find today are “full spectrum” lights, which is sort of a buzzword that means you can use them for vegging and flowering. But there are also models outfitted with a switch that allows you to change the light spectrum according to the phase. Moreover, some LEDs are made only for veg—emitting a bluish light that supports fast and vigorous growth—while others are made for bloom, giving off a reddish light to support bud development. So, before you get an LED light, make sure it’s the right type. For most growers, a full spectrum LED is likely what you’ll want.

If the basement is damp that’s why you would have mould. Yes totally get a dehumidifier! Run it so you get the basement at the right humidity first, It will dry out the room and give you a stable base. Then aim to keep the grow room around 55% I think and around 24 degrees and have several small fans that can be moved about easily. It’s also really useful to keep the humidity down if you’re using it to dry too. That’s when you have to really worry about mould! But on your bud not the room! Good luck ?

Thank you so much for sharing your experience.

When they have grown their second or third set of serrated leaves (after the the round cotyledons that initially emerge from the seed) seedlings are usually hardy enough to flourish in direct sunlight.

Comments

First time grower here. I didnt germinate I just put them in soil. Do I need to put light on them or just grow till till I can see them a little and then put light??

Good morning Susie,

With best wishes,

I had 20 plants just fall over I growning them inside .I put outside for a few hours got up the next morning.they were laying over.and I like to know why?

Example of soaking seeds in water, Credit: Wikimedia Commons

The concept here is to use a piece of growing medium, such as widely available peat pellets, and to plant the seeds directly into it.

Cannabis seeds only need three ingredients to be able to grow: heat, water, and air. Anything that provides those will result in a sprout, as long as the seeds are viable, so some precautions should be taken when storing seeds in warm or humid climates.

3. Peat Pellets

If it has not, the seeds should be moved to a different environment as too much water can drown them. 24-36 hours is the maximum recommended time for this and is only needed on seeds that have dried out for a long period.

They may end up soaking up more moisture than expected, so be sure to check on them throughout the process and add more water if needed. Not too much though, just enough to keep the paper towels damp.

Simply take the seeds and place them between a couple of wet paper towels. Next, take the towels and put them between two plates to create a sort of protective, dark dome. Finally, make sure it all stays relatively warm (70F-90°F) and after several days the seeds will begin to sprout.

Setups involving many pellets on a warming rack are colloquially known as “germination stations” and are very commonly used in both amateur and professional grows. Very little trauma to the seed can occur here, and the trauma of transplantation becomes a non-issue.