known2funkstarted grow question 4y ago
We've had some really warm weather the past few days. This morning, just before the lights switched off, i saw it was 31.1 degrees C in the grow tent. Are the yellowing leaves a concern? The yellowest leaves are really brittle. I don't believe they're under-waterd.
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GrowingGrannieanswered grow question 4y ago
It's not heat stress since that would be evident at the top of your plants - closest to the lights. My take is that this is their natural fade as they get ready for harvest and nothing at all to worry about... trim the yellow, brittle ones off if you want - they're not contributing to the plant at all any longer and you'll spend a WEE BIT shorter time in trim jail! LOL!
Good luck.... and happy harvesting!
Foffukuntzanswered grow question 4y ago
Heat waves can cause cannabis plants leaves to yellow and dry out indoors and outdoors. Temperatures above 28°C prevent cannabis plants from efficiently photosynthesising and cause buds to form more loosely and airy.
I don't think the yellows will ever be the same again, hopefully conditions improve, as long as you are sure PH and nutes have been all good I expect you are right.
But the temperature at my canopy is similar and green and pleasant land.
Who knows
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