I've had three plants go down in as many attempts. They grow fine in a 12 cm pot, not sure exactly what that is in the old scale 5 inches or so. I then transplant them into larger 20 cm pots and they start off okay but without fail a few weeks in, the leaves will start to yellow at the tips and then the whole plant yellows and dries to brown. First I used straight compost and after reading about overwatering I then grew in a compost perlite mix and the last attempt drained much better. The compost is matured to a powdery dark soil, could it be too nutrient rich? I'm also mainlining the plants and they're feminised or feminised auto-flowering. j
Auto flowers should NOT be transplanted , they should go directly into their final containers . I read this all the time , Also they do NOT take well to a lot of fertilizer . Also its suggest just planting and let them grow natural without trimming , branch manipulation