Light to canopy distance in flower stage, damaged pistils

Icu420

Active Member
The plants are 2 weeks since buds started developing.

Medium is synthetically prefertilized soil, compost, sand & perlite.

Lights are a panel of 9 led bulbs with 1 watt samsung diodes, diffusers off. Total of148watt and 12.5k lumens over 1.3 sqft.

When i was growing the seedlings i kept them 6-8 inches and had leaves point up as praying in that 2" zone, had no burn and fast growth.

A week or two into the budsite development i noticed that the pistils were getting damaged, not all at once but a couple of budsites were like this
Screenshot_20210309-173822_Gallery.jpg
So i moved the plants away from the light about 6" making the distance 12-13".

Then i regrettably foliar sprayed them with ground water high in humus content into which i dissolved some 10/2/4 npk, solution was ~1:7 water to fertilizer as i eyeballed it. I did this with lights off and let it dry.

After spraying and letting it dry out, next morning next to all of the pistils looked damaged or discolored.

Now it looks like this
Screenshot_20210311-115134_Gallery.jpg
They are kind of scortched and it's a bit difficult to see with these lights
Screenshot_20210311-115118_Gallery.jpg
Some look better than others
Screenshot_20210311-115043_Gallery.jpg

Basically i am not sure if moving the plants away from the light was a good idea and what caused the initial damage to the pistils, was it light or something else.

I am quite confident that the foliar spray did cause most of the damage but it doesn't explain the initial case.

I don't want to keep them too far away from light because i imagine that can have a big impact on the yield.

Thanks.
 
Last edited:

Dank Bongula

Well-Known Member
Were the bud sites with the damaged pistils kind of random or more situated directly under the light?

6-8 inches seems kind of close at 150watts...leaves praying means they are getting all the absolute light they can handle, but there is a fine line there when they start showing stress...so if you kept that light at that same distance and now it is flowering, it stands to reason that your flowers suffered some light burn. Moving the light away seems like a good call to start since you had damage before the spray.
 
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