GH only makes one line of dry nutes I believe.The Flora Series ( bloom,micro,grow,) are the expert series as GH calls it,and the Nova Series is a one bottle solution to the Flora Series, which is basically the Flora Series in 1 container instead of 3.If you plan on getting the Flora series you only need the Bloom and the Micro.If you buy the Nova Series you only need the Bloom.These 2 configurations will get you the same thing which is called the Lucas Formula.I have never used the Flora series but i use the Nova,( i use the grow and the bloom).If you buy a gallon of Nova it is concentrated and will last a very long time.Here is a link to the Lucas formula.
http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm