Controlling stem elongation in flower

[Bio boy]

Is the stretch dependable on Gibberellins. They are plant hormones that regulate various developmental processes, including stem elongation, germination, dormancy, flowering.. Etc


I jave a tangie who stretches 5 weeks in bloom.IIf GA is responcible could i organicly controll it? Block it?

Or would that also effect flower times and yields directly?



I saw studys on using plant extracts to control. in spinnach but cant access the study conclusions or cross them to cannabis.



Any 1 got aany dirt on the matter?

 

[troutman]

Genetics has lot to do with stretching. Pure Sativas get taller than pure Indicas normally. Size of the pot can control some stretching.
Smaller pots creating smaller plants that is. I've read that plants grow at lower humidity also have shorter internodes compared to high
humidity grown plants. Some people train plants to stay lower. The point is there's many variables involved.

 

[Guest]

Is your K accessible to the plant, and at a good presence? Is your N too high already?

My own practice and observation, for better or for worse, is that I leave the blue/white veg lights (4,000k to 6,500k) on for the first 2 weeks of bloom, (+/-), and make sure I have sufficient potassium (but not too much), which typically keeps the stretch with my plants fairly minimal.

More often, I have too much K.

I'm dealing with a fairly decent variety of genetics, and they've all (subjectively speaking) benefitted from the process I described in part... I believe.

 

[VerdantGreen]

The ratio of far-red light at the canopy to that which reaches lower leaves has a big influence on stretch. You need to try and stop the tops of the plants taking all the light and shading the lower leaves and branches. Sometimes i will cut off some of the leaf fingers of the upper leaves to allow light into the lower canopy.

using a light fixture that has many light emitting sources such as a QB led also helps because there is less oppotunity for the upper parts of the plant to create shade.


keeping night and daytime temps fairy even also helps ime


VG

 

[RockinRobot]

I run MH first 3 weeks of flower and keep night temps about the same as day temps. Both help keep my sativa dominant strains a little shorter.

 

[St. Phatty]

Give them LOTS of light.

reduce the light and they seem to stretch more.

 

[f-e]

The ratio of far-red light at the canopy to that which reaches lower leaves has a big influence on stretch. You need to try and stop the tops of the plants taking all the light and shading the lower leaves and branches. Sometimes i will cut off some of the leaf fingers of the upper leaves to allow light into the lower canopy.

using a light fixture that has many light emitting sources such as a QB led also helps because there is less oppotunity for the upper parts of the plant to create shade.


keeping night and daytime temps fairy even also helps ime


VG

I'm finding the ratio with LED to be Bugger all:Bugger all. Leading to very little stretch unless I supplement the IR using, for me, Halogens.


What about Ca. I have seen a few people talk of Ca being kept low as it reduces stacking. Edit: High levels reduce stacking. Which is 3rd n 4th week stuff with HID's

K I'm surprised to hear. I switch to bloom feed earlier to get a bit of stretch. In my mind it's the K doing it. It's related to root and stem growth.

 

[VerdantGreen]

LED does reduce stretch pretty dramatically compared to HPS. My LEDs have IR wavelengths which encourage a little more. Some stretch is quite useful.. too much stretch is problematic.. especially when you grow in cabinets just a few feet tall!