Help me identify my problem. It’s happening to the 3 largest plants out of 6 (all different strains)

Yes to burning. No to a deficiency. Probably due to a nutrient salt build up in the substrate.

Ich sag K-Lockout durch zu viel N. 👽

Definitely proper nutrients burned, all the tips leaves are burned. Creating random nutrients lock out due to the hypertonicity of the media. Check the conductivity of the runoff

ps could also just be straight K hunger, not necessarily lockout demand in flower ramps up fast and sometimes supply just doesn’t keep up. either way, same approach.

I can’t be a 100% without extra info but that isn’t classic burn. Burn starts clean at the tips and looks way more uniform. Here it’s random spots + crispy edges, sometimes starting mid-leaf, which means the plant can’t access something it needs. In flower that’s almost always K getting locked out. Demand shoots up, buds keep going, and the fans take the hit. Happens a lot if EC crept up, pH drifted, etc etc But the fix is the same either way: don’t panic, don’t flush hard, check runoff, and just help it finish. Those leafs aren’t coming back, buds look fine, that’s what matters. Hope this helps you ✌️ ♥️