I just got the reply from Fox Farms.

I was told that Big Bloom doesn't have enough phosphorus in it to use as a stand alone fertilizer when your plant is flowering. Also, the Tiger Bloom and the Grow Big both have your necessary micro's.

You can use Big Bloom in combination with Tiger Bloom. (already knew that according to their schedule)

Big Bloom can be thought of as a catalyst. Big Bloom can be used the entire plants cycle, on new plants, and on plants that are not doing well.

Handy info, hope it helps. :jointsmile: