Stickanswered grow question 6 years ago Hi there! Burnt tips and spots onto the leaves show that they suffered from overfeeding. Were you really applying a 4.2 EC during weeks 6-7-8-9-10? Considering you're using LEDs, the distance between the light and plant's summits could have been smaller. Also if you're really watering with 18L everyday, they must have been overwatered more than once. Finally, buds usually fatten during their 2 last weeks, so you still can see them get bigger in the next days. Hope this helps, I'll be around, keep us up-to-date and happy growing!