PillyPanswered grow question 4 years ago Hey im doing my first grow too but have been doing a lot of research usually you dont give any nuts until the first set of razor leaves are showing. Even then most do 1/4 the recommended dose. thats is if you're usually in coco. If you are in soil, depending what kind and how much nuts are already in it you could only use water up to about 4 weeks. hope this helps!