Quote:
Originally Posted by silken
When you are feeding them, you could try boosting their potassium (middle number) in the fall also. Potassium helps encourage flowering.
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Fertilisers list N-P-K
K is actually potassium (look at a periodic table

)
P is phosphorus AKA in horticultural circles as "potash", and is actually the part of your fertiliser conventionally considered to be a "bloom booster".
Some people think the bloom boosting effect comes less from the P, but more from reducing the relative proportion of N!
(N being Nitrogen, which encourages vegetative growth like leaves).