Phototropism vs gravitropism...

ttystikk

ttystikk

Well-Known Member
@Lucky Luke thanks for the shout out, it's nice to know all that work didn't go unnoticed!

OP, what you aren't accounting for is the surface area of the wall. There's a lot of room there. Do the math.

Second, if you want a stronger phototropic response, use higher Kelvin lights. 3500K won't get them to notice the light source like 5000K or 6000K will.

The other thing to keep in mind is those bud stalks have a surprise in store late in the run; they like to sag and fall over! If you have a good run going, it looks like dozens of fat green dicks falling towards the light lol
 
S

SamWE19

Well-Known Member
ttystikk said:
@Lucky Luke thanks for the shout out, it's nice to know all that work didn't go unnoticed!

OP, what you aren't accounting for is the surface area of the wall. There's a lot of room there. Do the math.

Second, if you want a stronger phototropic response, use higher Kelvin lights. 3500K won't get them to notice the light source like 5000K or 6000K will.

The other thing to keep in mind is those bud stalks have a surprise in store late in the run; they like to sag and fall over! If you have a good run going, it looks like dozens of fat green dicks falling towards the light lol
Click to expand...
What do you mean I’m not accounting for the surface area of the wall? When working out my grow space I take the wall as if it was the floor and work out my square footage using the wall instead of the floor.

Can’t switch my leds now but I could add some extra strip lights in between the cobs. How many watts of these 6000ks do you reckon I’d need?

So far my buds haven’t tended to sag anymore than my supercropping has done. My stems are strong from the silica though
 
Renfro

Renfro

Well-Known Member
If left to their own accord, some strains like to spread out and others like to grow straight up, some sorta in between. So some genetics lean more towards phototropism and others more towards gravitropism. Another good reason to select genetics suited to your growing system.
 
Rob Roy

Rob Roy

Well-Known Member
Renfro said:
If left to their own accord, some strains like to spread out and others like to grow straight up, some sorta in between. So some genetics lean more towards phototropism and others more towards gravitropism. Another good reason to select genetics suited to your growing system.
Click to expand...
Robert C. Clarke described a creeper pheno in his book published a few years back

It's likely some equatorial sativas had to be creative to fight other plants both cannabis and non cannabis to get to the light.

Primordial Indicas probably had less worry about access to light / competing with other plants and more worry about drought and cold etc.





1575902199229.png
 
ttystikk

ttystikk

Well-Known Member
SamWE19 said:
What do you mean I’m not accounting for the surface area of the wall? When working out my grow space I take the wall as if it was the floor and work out my square footage using the wall instead of the floor.

Can’t switch my leds now but I could add some extra strip lights in between the cobs. How many watts of these 6000ks do you reckon I’d need?

So far my buds haven’t tended to sag anymore than my supercropping has done. My stems are strong from the silica though
Click to expand...
I ran 3500K LED lights and if I could start over I'd go with 2700K 90 CRI LED lights, then supplement with UVB. Training is what accomplishes good coverage on the trellis panel, that never changes.
 
gr865

gr865

Well-Known Member
5 screens, 5.55 sqft/screen. So 5 screen equal 27.77 sqft. in a 4 x 4 that equals 16 sqft.
I have to net them up to keep them out of the lights.
Net removed
20200122_100852.jpg

Netted back to the screen.
20200115_094141 (2).jpg

After installation
20200115_094305 (2).jpg

13 days later.
20200128_091852 (2).jpg

If I just left them alone they would grow into the lamps bigtime.
 
zep_lover

zep_lover

Well-Known Member
plants want to grow up.i veg horizontal and when they go in flower they are only lit by vertical light.at start of flower usually the plant is not as tall as my light bars so the top cob is higher than the plant but it is still side lighting them on an angle.some shoots always reach out for the light though not the whole plant till the buds are getting heavy.i just chopped the plant in the picture(24 days after this pic)and got 460 grams from 320 watts20200102_235942.jpg
 
Aussieaceae

Aussieaceae

Well-Known Member
Figure maybe people aren't accounting for gravity here?
The plants have no choice but to compensate for it, to support themselves, by growing upward. It's imo how they've had to evolve. Only in nature the sun is upward as well, so it's not as obvious.

In my own experience, a plant always grows in the direction of light.
Outdoors, you can literally observe the plants moving with the sun, as it moves across the sky.
Where there is more light, there is more plant matter.

This would have to be the case for vertical grows as well, i'd assume.

Thinking out loud here, but feel the need to mention it.
Imho OP was mostly correct and on the right track.
 
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