It takes a few weeks to break down in the soil, also bone meal raises soil ph.. so take that into account. Blood/Bone is really good when you allow it to break down over many seasons. It's not a "flower" nutrient in the short timeframe (8 weeks) you have to flower. You'd be better served buying some nutrients specifically for flowering and watering w/ them.
Damn i heard from a another forum that it was good for flowering what do you all recoomend for auto flowering strain?