Actually, for the bloom booster, it is a misconception that you must feed it when the plant is in bloom. Bloom booster should be used well before spikes appear, in the period where the plant should normally be initiating spikes. The bloom booster helps with that process. So if you were to use in on phals, most initiate spikes in the fall, so that's when you would give it.
Using bloom booster for a plant already in spike will do nothing.
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Camille
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