krippy

@Dadasgrow, thanks bro ;)

@krippy, That would help a lot

@Stick, even with organics nutrients? I tried one time to read ppm but the measurement was very low... I knew that instruments don't read them... I'll try to read the runoff next time...

@Stick, thank you so much for the answer, I was thinking about it but wasn't sure because I gave just half dosages, I'll do as you suggested next watering ;) Did it... watered with 1ml/litre of enzymes and checked the EC runoff... All plants have a runoff EC between 2.6 and 3.2

Hi @krippy! These are the first signs of a Nitrogen toxicity. Considering you're growing autoflowering strains, you should be very careful about the nutrient intakes, since autos are usually very sensitive to nutrients, they don't need such doses of fertilizers. In this situation I would flush the medium for 2~4 days with plain pH'd water then see how it goes. Don't give any nutrient until the new growth have stopped showing burnt tips. Affected leaves won't recover but the yellowing/burning should not spread if you treat your medium asap. Hope this will help, keep us up-to-date and happy growing :facepunch: