Seedling Stage of Cannabis

Seedling of 2 weeks old

The seedling stage of cannabis follows on from germination. You will be able to tell when it has begun when your shoots start to develop a second set of leaves. These will look different to the embryonic cotyledon leaves. They will be bigger, with a long serrated edge – a look that is much more associated with cannabis plants. However, these new leaves will only have one “finger”, instead of the 5 or 7 normally seen in adult leaves.

After this your cannabis plants will start to grow a third set of leaves, these will tend to have three fingers. This will be followed by more and more leaves, with each one beginning to resemble the expected cannabis leaf shape more and more. As mentioned, the most common and expected is a 5 or 7 finger leaf, but do not be surprised if you end up with 9 or even eleven fingers!

The seedling stage is usually over when you start getting leaves with their maximum amount of fingers. Other indications will include a stem with a thickness of around 4-6mm and a height of around 3-4 nodes. During this stage the seedling will also try and develop a strong root base, this will allow for strong future development and nutrient intake. Depending on where you grow, the seedling stage can take roughly 2-3 weeks indoors and 4-6 weeks outdoors.

As an extra tip, it is usually advisable to set up a small, weak fan to blow on at your seedlings. This will help them gain fresh air and encourages strong growth. It does this by giving the plant something to resist. As the fan blows at your cannabis plants, your seedlings will recognize that they need to put extra effort into growing and developing their structural integrity to withstand possible future sources of resistance.

You will know the time to transplant your seedling to a larger grow medium when you start seeing signs of its developing root base. Chances are your seedlings will be growing in individual, small pots. As their roots grow they will start to exit out the holes in the bottom of these pots. This shows that they need more room and are ready to be moved. Be very careful transplanting them though, roots are very fragile and any damage can have very serious implications into your cannabis plants' ongoing health.

Light during the seedling stage

There are a lot of cultivators out there who put their seedlings under florescent tube lighting, either for cost purposes or lack of better knowledge – it is in no way ideal. Due to the weakness of florescent lighting they need to be places quite close to your seedlings – about 5 cm above them, (don't worry, they do not produce much heat, so this is fine). This causes your cannabis seedlings to grow broad – you end up with long plants with thin, weak stems that will easily fall over. This is fine if you are willing to offer your plants support, but it is not a good foundation to lay if you want healthy, vibrant plants in the long run.

The preferred way is to use HID lighting. HID lights produce a much better quality of light for growing cannabis, leading to stronger, healthier plants. The offset is that they produce a lot more heat - something your marijuana seedlings are very vulnerable too. For this reason it is important to make sure your lights are at the correct height above your plants. Start by having your HID lights 80cm above your plants, lowering them by 5cm each day until you are in the region of 40-60cm (depending on the wattage of your bulbs). Also, always preform the hand test to see if things are getting a bit to hot.

In terms of color-band, it is best to go for a bulb within the blue spectrum. This will encourage strong and healthy stem and leaf growth.

During the seedling stage, most cultivators will use an 18/6 photoperiod. It is also possible to do a 20/4 period, with some cultivators going as far as using a 24/0 period to really boost growth!

Nutrition during the seedling stage

Generally speaking, seedlings are pretty self sufficient. However, as stated in our germination article, using a seedling/germination soil is recommended. This will have the finer, small amounts your cannabis seedlings can use. You should note, cannabis seedlings are extremely vulnerable to overfeeding, any excess will cause root burn, killing off your plants.

As a result, novice cultivators are strongly advised from adding anything to your soil other than clean, distilled water (pH of 6.5-7). Your seeds should have everything they need and will need minimal extra input from you. Just make sure they have the water and light they need and they will do fine. Once your seedlings have grown, they will enter the vegetative stage of their life cycle.

Comments

Submitted by Mica (not verified) on
I am a new grower and I'm having trouble getting my plants to look good. Seedlings are tall and thin.
Submitted by skyler (not verified) on
The problem is most likely your lights. My best guess is that the bulbs you are using have a low concentration of blue spectrum rays and higher red spectrum. This causes the plant to stretch in search of light. Leaving you with weak seedlings. This article says that florescent bulbs are no good but if you buy t5 bulbs they provide Sufficient spectrum.
Submitted by danny.p (not verified) on
perfect information thanks ever so much for explaining, many people right a lot of crap and i can never get my head around it but top guy for this! o yeh btw how far away should i keep my 2 300w giant dual spec bulbs away from my 4 seedlings would you say to start with?
Submitted by danny.p (not verified) on
o yeh i forgot to add how far away would you say i should put my 600w hps away from the 4 plants when there in flower? sorry about this im a newbie to growing ;p
Submitted by Josh (not verified) on
My seedling is only about 2 weeks old. It has it's first set of true leaves already. I'm worried because the cotyledons are turning a bright yellowish white color. Why do I do??
Submitted by dontree420 (not verified) on
We have been making our own seeds  for 8 years, and we are in our 7th year of producing top shelf seeds for the public. These are all regular seeds (about 80% will be females). Blackberry Diesel (indica) Does very well inside and outside, producing lots of large fat, rock hard buds loaded with trichromes and a blackberry fragrance. Flowering period is 8-9 weeks. Grape Afghan Kush (sativa hybrid) This has been crossed with Grape 48 so it will provide big fat very frosty buds with a wild grape-Afghan smell. Average indoor yield is 2 oz. per plant. Flowering period is a lengthy 9 to 10 weeks. Pauls Purple Fire (indica hybrid) OUT OF STOCK This is one of my best strains. Purple Fire (SFV OG Kush x Grape Ape) crossed with AK-48 and then crossed with original Grape 48. If you like fat, hardball buds similar to GDP, you will love this strain. Flowering period is 8 to 9 weeks. NEW Grape 48 (Indica hybrid) OUT OF STOCK One of my best strains. This strain will make you very happy. Grape 48 is Seedsman Purple Bud crossed with Nirvana AK-48 and now crossed with Purple Kush for density. It will produce monster-sized very dense buds covered in trichromes and with a loud grape smell like Grape Ape. Flowering period is 8-9 weeks. Original Grape 48 (Sativa hybrid) – OUT OF STOCK The original strain without the genetics of Purple Kush (Nirvana AK48 x Seedsman Purple Bud). The big sativa buds are a little fluffy and extremely frosty. The strong grape aroma of the Seedsman Purple Bud really comes through. Trainwreck (Sativa hybrid) – OUT OF STOCK — MORE COMING SOON! This particular strain of Trainwreck came from a clone and was crossed with an AK47 male. The smell from the bud is awesome and so is the taste. She will produce lots of big thick sticky purple colas. Trainwreck is a heavy yielder. This is a great night time sleepy time high. Purple Wreck (Indica hybrid) – OUT OF STOCK — MORE COMING SOON! Purple Wreck from Reserva Privada is Trainwreck crossed with Purple Erkle. Another great top shelf strain – very frosty, very stinky and very dense buds make it an excellent medcinal choice. Call/text……….… (518 444 2976) Call/text….……… (518 444 2976) Email (clovisbale@gmail.com) ___________________________________________________ Other strains available: Blue Cheese (Blueberry x UK Cheese) LIMITED SUPPLY Blueberry OG Kush (Blueberry x Tahoe OG Kush) – OUT OF STOCK Blue Tahoe Cheese (Blue Cheese x Blueberry Tahoe OG) – LIMITED SUPPLY Playboy OG Kush (indica) [ LIMITED SUPPLY ] Purple Berry Playboy (Purple Berry xPlayboy OG) -NEW! Lemon Skunk -NEW! Early Skunk – NEW! WE HAVE 4 BRAND NEW TOP SHELF STRAINS COMING OUT IN THE NEXT 2 WEEKS INCLUDING: BLUE CRUSH (BLUEBERRY OG x GIRL SCOUT COOKIES) BLUEBERRY OG WRECK BLUEBERRY OG GDP BLACK N BLUE (BLUEBERRY OG x BLACKBERRY DEISEL) ___________________________________________________ $1.00 each (min order 25) 500 or more – GET 25 FREE SEEDS WITH EVERY 500 SEEDS ORDERED! Willing to trade for other seeds or meds. No clones. /text……….… (518 444 2976) /text….……… (518 444 2976) /Email (clovisbale@gmail.com) Call/text……….… (518 444 2976) Call/text….……… (518 444 2976)  

Add new comment