I'm sorry Stinky but I have to disagree with this: "'Even' ferts won't provide enough nitrogen relative to other components for a rapidly growing annual indoors."

The plant, in my opinion, will be fine. The manufacturer wouldn't go through the trouble to make the fert even if it didn't work. It does work. The more important issue is one of time. Powdered ferts that don't dissolve readily in water can require alot of time to break down. Bacteria does the work to break things down in soil. Anyone that has used bone or blood meal indoors has learned this one the hard way. Besides, if you use a low P-K kind of fert, you'll have to boost those in bloom.