never separately.. if oyu do that, you end up leeching the rpevious nutes out of there is any runoff... or changing concentration of previously fed nutes by adding more water without it.
it's probably ust "magic". read the ingredients. it's just ubiquitous commodities used as ingredients in all fertilizers... there's no magic sauce out there that makes buds bigger or tastier then their genetics allow or "accellerate" anything at all.
it may be useful, but don't read into the nonsense marketing about these products.. that's for the uneducated and the desperate.