Lighting how to use autocob distance to control plant height

[lunarman]

Does the distance from cob to canopy do any training on the plants that will alter/change the plant height?

Let's say you have a couple of identical plants early in veg and 2 autocobs, 1 per plant.

If I have a distance of say 30 inches for one plant and the other is at say 16 inches (with no bleaching or heat stress), will the plant at 30 inches be very different structurally than the plant at 16 inches? One would be taller and lanky, and the other shorter and squatter.

I know there are lots of other variables but just ignore that. In general will the autocob height effect the structure of plants like this?

 

[BigSm0]

Does the distance from cob to canopy do any training on the plants that will alter/change the plant height?

Let's say you have a couple of identical plants early in veg and 2 autocobs, 1 per plant.

If I have a distance of say 30 inches for one plant and the other is at say 16 inches (with no bleaching or heat stress), will the plant at 30 inches be very different structurally than the plant at 16 inches? One would be taller and lanky, and the other shorter and squatter.

I know there are lots of other variables but just ignore that. In general will the autocob height effect the structure of plants like this?

Yes it absolutely will. It is always best to keep the lights as close as possible without harming the plants. Currently i have 4 plants under 1 cob that are a bit long and lanky. Across I have 3 plants under 2 cobs with the light lower and are stacking nodes on top of nodes.

 

[lunarman]

Forgive my newbiness @BigSm0 but I have stunted a couple of plants that are like dwarfs in my first grow. It's embarrassing Now I'm trying to get taller plants. And I think at one time you said my lights are pretty close and I think that is part of the reason (but not the only for sure) my plants were short. So I'm learning and asking questions and trying to come up with a better light management regime than grow number 1.

So now I'm growing my second run and have 2 plants that are already pretty much taller than my 4 from the first run. I'm of the mind that I want them to be tall. So I'm keeping my lights maybe 50% further away than my last run. I could get them closer without any obvious harm (bleaching, leafs curled up) but I'm choosing not to go super close. My plants are pretty bushy actually. Not really that tall but taller than before. But when I look at other peoples grows mine look like they are short and squat still.

Maybe I should take some pictures to show you what I mean.

 

[BigSm0]

Pictures would definitely help. I know what your trying to do but I can say with confidence bigger buds from more light surely out weighs taller plants. As you mentioned the learning curve will play a part in it too. I wouldn’t necessarily raise the lights to the ceiling but a few inches at a time should help promote stretch. As well as longer lights out time and also prolonging the veg nutrients and holding off on the PK till preflowers are in full form.

 

[KonopCh]

Kelvin temperature will also influence on size of plants.

 

[Arthur]

What genetics are you growing? That's gonna dictate what can be achieved. Some strains are pretty small, others get downright big...

 

[lunarman]

Kelvin temperature will also influence on size of plants.

In what ways does temp affect size? Too hot or cold, they stay small? Is there a target temp that is good for height?

 

[Mizzo81]

Kelvin tempaerature is basically the color spectrum of the light. 6500Kelvin is in blue spectrum while 3000 Kelvin is in the red spectrum. The blue spectrum will be keep plants shorter and while they say the red can promote stretch. I wouldn’t try to stretch your plants that weakens it’s structure and may cause it to fall over. just don’t keep them too close and they’ll reach what they should reach. I would be more concerned about keeping an even canopy and creating more equal bud sites for a better yield. Less popcorn more nugs.

 

[lunarman]

Kelvin tempaerature is basically the color spectrum of the light. 6500Kelvin is in blue spectrum while 3000 Kelvin is in the red spectrum. The blue spectrum will be keep plants shorter and while they say the red can promote stretch. I wouldn’t try to stretch your plants that weakens it’s structure and may cause it to fall over. just don’t keep them too close and they’ll reach what they should reach. I would be more concerned about keeping an even canopy and creating more equal bud sites for a better yield. Less popcorn more nugs.

What newb/rook I am! I was thinking K as in a heat unit not light spectrum. My autocob's are all 3500. And HPS is whatever they are - geared for bloom not veg obviously.

 

[KonopCh]

HPS is around 2100K. Ideal for bloom.
For veg I would go with 5000K, ideally with 4500K.