IF you are using soil with no nutes, then you need a seperate nute regiment for each cycle, usually a heavy N for veg and a heavy PK for flower. Otherwise you can end up with too much PK and end up with nute burn, not to mention both tend to have the trace elements and you can get an overdose of them (CA,MG, ect) if you combine.Was wondering wen the best time to start adding flowering fertilizer?? Also would it be smart to do a veg fertilizer with a flower fertilizer from beginning grow to flower then stop veg fertilizer n just continue wit flower fert??