First run experimenting with 24 hour lights. 24 hours of light to keep the temp up in a cold basement, humidity around 60% is what I can manage at the moment, with temps in the low 70s.
I have two double grape and they were getting burnt tips really bad. Have seemed to come out of it since feeding but other cultivars I’m growing the same way looked great before and after feeding. I will follow your grow as I’m just a couple weeks ahead of you.