21 Days flowering (Any tips) Pic.s

Here are my 4 girls out of 20 plants I started with 2 1/2 months ago. to me they seem to be growing sloww but this is my first grow. at what point should i see a big change in the size if the buds?

looks like sativa and looks right for its age. i think the last week or 2 you will see a big change. heres my indica at 24 days of flowering. and good luck. ] what nutrients are you useing?

I have used Earth Juice from the start. But I only go with the mild Mix I'm to afraid of burning my girls... How can you tell what type of plant it is or Gene?