Brown Edges Mean Potassium


Crispy leaf margins on a flowering CBD plant usually point to potassium running short, not heat.

Older leaves with brown crispy edges and yellowing that creeps in from the margins during mid flower are the classic potassium shortage, and it is common on CBD plants in soil that was never topped up after veg. Heat stress looks similar but starts at the top of the plant nearest the lamp, while potassium starts low. A side by side photo guide, plus which amendments supply potassium without adding more nitrogen, is on https://calmcbdseeds.com. Kelp meal or a langbeinite top dress usually turns it around within ten days.

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