Yellow/burned tips & curled leaves

If you’re growing in coco, you absolutely need to keep your pH levels under control. Regularly check and precisely adjust the pH – it’s crucial for proper nutrient uptake. You’re in the flowering stage now, where the buds are starting to swell. During this phase, the plant’s demand for potassium and phosphorus increases significantly. The yellowing of the leaf tips, progressing from the edges toward the base, could be an early sign of potassium deficiency. It would be wise to adjust your nutrient regimen accordingly to address this issue.

j'utilise aussi le bio bizz comme terreau le allmix et j'ai pareil, j'ai demandé la solution et cela viendrait du terreau car trop riche pour des autosflos (c'est ce quon ma répondu) une autre personne avait le meme pb que nous deux et la réponse a été celle ci : Biobizz → trop riche je ne sais pas réellement si cest la bonne réponse mais je ne vois que ca :)

Do not super crop at this stage of flowering.Its going to weaken your plant and don't flush them.They say to never give coco plain water.The tip burn will be too much like Iv said so reduce like Iv said.Tripple check all advice,including mine.I make mistakes,Im human.

Hey 👋 I wouldn’t say that Lightstress is the reason. If your plant gets too much light her leaves will get burned tips which will mainly roll upwards. If they roll downwards and get burned this is mainly a sign of too much nitrogen. The plant in the upper left corner of your 4th photo shows comparable indications. Hope I could help. Happy growing 👊🍀

Flush 'em. Get your soil or whatever right again. If they recover resume regular feeding. Cut your daylight down to 12 hours. If you're having trouble maintaining your canopy, supercrop the taller colas to bring the canopy level.

It not the light its whats called tip burn which is caused by an excess of nutriants.I'd turn the light up and have it as close as poss at this stage,mid flower.That does depend on how strong th elight is.