I NEVER use a bloom nute that is devoid of nitrogen. Tiger Bloom by fox farms has enough nitro to support plant growth/nitro needs during flower, as do many others. I agree with what everybody is saying about nute balance. It is easy to over feed & have problems with nute burn. I dilute the recommended amount by half untill/unless the plants say they need more. They will tell you if you pay attention & learn their language.