Use something that has a higher P rating.. Like 10-60-10 at 1/2 strength,then increase dose as flowering increases.

That is only an example. You'll be safe with that,cause I use 2-3-5 Pure Blend Pro Bloom.

Ga.
GaGrown Reviewed by GaGrown on . Is 5.0-3.0-8.0 a good NPK?? Just need to no if this is an ok NPK and cud it be used in flowering? Rating: 5