-10°C Greenhouse Without Heat: Survival Botany

So my thoughts: tips of the upper leaves are curled downwards (clawing), leaves are glossy, dark green, shiny, some tips are burned, all indicates Nutrient toxicity. And i bet you are thinking "wtf, how can it be a toxicity, i can clearly see a deficiency " and you're right. The problem is you probably hammered in SO much nutrients the plant just can't uptake anything anymore. imagine, as the gates of the plant are SO crowded with soooo many people, nobody can move in, or at all. Whatever you do, more fertilizer is not the answer you are looking for. I would guess too much fertilizer o r very, very wrong pH. I can't tell what it is but it's probably the first. Only thing you can do is flush the pot. until you have like 1-3L run off (depends on how big the pot is), to wash out all the salts. best thing if you can flush with pH water pH 6 should be fine for soil, demineralized water usually got a pH of 6 (if you live in europe otherwise idk) if you have nothing else. This happens to all of us, we all did this... don't worry, good luck!