weed stopped growing after putting under led

hello rollitup. hope it's ok to just sign up, jump in and ask 'help me' questions which is basically what im doing here. ive read so much over the internet and got a headache now so i thought i'd just see if i can get a hand here!

shall i explain my problem, if it is even that (maybe im worried about nothing). i planted four seeds in separate grow pots 13 days ago. they sprouted and on day 9 (ie four days ago) i put two of these under led lights (20 hours on/4 hours off) and the other two i continued (and will continue) putting under sunlight in the window. i didnt start with the seeds under the lamp because i was actually waiting for the lamp to get delivered. the lamp is a mars hydro 300w.

anyway, cut to today and there is a noticeable difference in vitality between the led plants and the sunlight plants. while the sunlight plants have continued upwards the led plants have stopped growing (seemingly) and everso slightly droop. im wondering if they're just stabilizing in new conditions or maybe something is wrong. maybe it's too early to worry.

also there are tiny bugs attracted to the led lamps at night.

so anyway, cheers for any help and to everyone

It sounds like your window sill seedlings are stretching towards the light...long stretchy seedlings should be avoided. The ones under the LED are probably getting a whole lot more light than your window sill ones since they are so exposed to their light source and have stopped vertical growth because they don't need to stretch for the light anymore.

Continue on this way and you'll find the LED one out growing your window sill pretty soon.

alright Cyrus420, cheers mate, thanks for the quick reply. that's a good point actually, i'd have never thought of that. the led seeds wont have stopped growing right? just that they are now doing so much more slowly? they're maybe an inch above the soil.

Same temps/humidity in both places? Transpiration makes a big difference.

You should see the led plant fatten up while it slowly grows taller, much more light absorption when close to an led.

thats interesting. great! im very pleased i asked now because i was thinking 'oh crap'.

i'd say the temp and humidity is slightly different (higher) under the led because it's closeted in a wardrobe. however the wardrobe has no back! so there is ventilation and also i open the windows of the room that the wardrobe is in regularly (where the insects come from!). also i live in central europe so there is no extremes in weather. i'd guess the temp and humidity in the wardrobe isnt too much higher.

can i just ask about transpiration. i know there's loads of info everywhere on the internet but i cant keep reading the same pages again because it hurts my head. what i can infer from your post is that the temp and humidity effects the plant's transpiration, transpiration being sort of the plant's efficiency at using the water i feed it with. and with this in mind, therefore too hot and humid an atmosphere makes the plant less efficient?

thanks Douglas.Curtis

zurich said:

alright Cyrus420, cheers mate, thanks for the quick reply. that's a good point actually, i'd have never thought of that. the led seeds wont have stopped growing right? just that they are now doing so much more slowly? they're maybe an inch above the soil.

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Seedling will stretch until they reach a point where they can best absorb light. They haven't stopped growing just stretching because the seedlings are absorbing more light from your LED than your window plants.

zurich said:

thats interesting. great! im very pleased i asked now because i was thinking 'oh crap'.

i'd say the temp and humidity is slightly different (higher) under the led because it's closeted in a wardrobe. however the wardrobe has no back! so there is ventilation and also i open the windows of the room that the wardrobe is in regularly (where the insects come from!). also i live in central europe so there is no extremes in weather. i'd guess the temp and humidity in the wardrobe isnt too much higher.

can i just ask about transpiration. i know there's loads of info everywhere on the internet but i cant keep reading the same pages again because it hurts my head. what i can infer from your post is that the temp and humidity effects the plant's transpiration, transpiration being sort of the plant's efficiency at using the water i feed it with. and with this in mind, therefore too hot and humid an atmosphere makes the plant less efficient?

thanks Douglas.Curtis

Click to expand...

Right now that is a really complex thing to learn about. For the time being you should focus on mastering the growing of the plant rather than perfecting it.

Keeping your temperatures below 85F and humidity high during veg and low during flowering is the basic for you at this point. Keep in mind that while growing you're going to find what works for you. Right now I grow in organic soil, water with tap soil, and besides basic equipment pay no mind to special equipment or achieving perfect conditions.

You can see my single Lemon Kush bushing out real well in this picture. I simply water with tap water every couple of days and tie her down with plant training wire to get her to bush out the pot without growing vertically. Very little effort but a beautiful plant IMO. She won't be the best plant ever grown but I feel with a simple grow will come simply great results.

All I'm saying is get the essentials down before you begin to worry about the scientific side of growing. It helps a lot to have a more general understanding of the plant while it's in action once you begin exploring the scientific side.

zurich said:

thats interesting. great! im very pleased i asked now because i was thinking 'oh crap'.

i'd say the temp and humidity is slightly different (higher) under the led because it's closeted in a wardrobe. however the wardrobe has no back! so there is ventilation and also i open the windows of the room that the wardrobe is in regularly (where the insects come from!). also i live in central europe so there is no extremes in weather. i'd guess the temp and humidity in the wardrobe isnt too much higher.

can i just ask about transpiration. i know there's loads of info everywhere on the internet but i cant keep reading the same pages again because it hurts my head. what i can infer from your post is that the temp and humidity effects the plant's transpiration, transpiration being sort of the plant's efficiency at using the water i feed it with. and with this in mind, therefore too hot and humid an atmosphere makes the plant less efficient?

thanks Douglas.Curtis

Click to expand...

Transpiration is the movement of water from the roots through the plant. 90%+ of the water a plant absorbs is evaporated off the leaves. Transpiration is used for both cooling the plant and for maintaining hydration levels. Unfortunately, cannabis is only capable of handling a certain amount of transpiration.

You really have 2 choices:
High Heat and Humidity, the plant uses transpiration to keep cool
Low Heat and Humidity, the plant uses transpiration to stay hydrated

I grow in low heat, low humidity. My research shows it grows more trichomes and also produces(and retains) higher levels of terpenes. In addition, low heat and humidity significantly slow bug and other issues.

Good stuff.

Count the nodes on the sunlight vs led you want close nodes not stretchy nodes

the bugs on the lights is not good at this early stage , probably hatched from the soil. the window baby's are stretching for the sun, not enough sunlight.

Cyrus420 said:

Right now that is a really complex thing to learn about. For the time being you should focus on mastering the growing of the plant rather than perfecting it.

Keeping your temperatures below 85F and humidity high during veg and low during flowering is the basic for you at this point. Keep in mind that while growing you're going to find what works for you. Right now I grow in organic soil, water with tap soil, and besides basic equipment pay no mind to special equipment or achieving perfect conditions.

You can see my single Lemon Kush bushing out real well in this picture. I simply water with tap water every couple of days and tie her down with plant training wire to get her to bush out the pot without growing vertically. Very little effort but a beautiful plant IMO. She won't be the best plant ever grown but I feel with a simple grow will come simply great results.

All I'm saying is get the essentials down before you begin to worry about the scientific side of growing. It helps a lot to have a more general understanding of the plant while it's in action once you begin exploring the scientific side.

Click to expand...

thanks for the great advice off the bat. mouth watering plant there i must say. i definitely like the advice about keeping it simple and not getting myself weighted down in the abstract ... just yet anyway. the science and tech theory stuff will be more revelatory and interesting once ive gone through a grow cycle myself.

Douglas.Curtis said:

Transpiration is the movement of water from the roots through the plant. 90%+ of the water a plant absorbs is evaporated off the leaves. Transpiration is used for both cooling the plant and for maintaining hydration levels. Unfortunately, cannabis is only capable of handling a certain amount of transpiration.

You really have 2 choices:
High Heat and Humidity, the plant uses transpiration to keep cool
Low Heat and Humidity, the plant uses transpiration to stay hydrated

I grow in low heat, low humidity. My research shows it grows more trichomes and also produces(and retains) higher levels of terpenes. In addition, low heat and humidity significantly slow bug and other issues.

Good stuff.

Click to expand...

thanks mate. im going to go read about humidity level control now because my reading headaches gone. appreciate the help.

RolllingStone said:

Count the nodes on the sunlight vs led you want close nodes not stretchy nodes

Click to expand...

cheers mate. im glad i reached out to the forum coz it's like a cascading of education: ive just been reading about internodal distances after i read your post for example. didnt know about that until now.

claypipe69 said:

the bugs on the lights is not good at this early stage , probably hatched from the soil. the window baby's are stretching for the sun, not enough sunlight.

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oh really? crap. i thought the insects must have come in the windows of another room coz its summer here and at night they come for the light inside the house. and then i figured they saw the amazing led lamp leaking out the wardrobe cracks and thought it was like manhattan penthouse living in there. so i gotta ask claypipe69 ... you think i should zap the bugs if they persist? of course right?