I'm not sure what you mean by the plant's "hormonal phase", but the hormones in the paste trigger undifferentiated cells to begin to do so, and already-differentiated ones to grow.
If bracts are removed from the flower spike (those little flaps of tissue at the nodes below where the flowers formed) and the paste is applied there, keikies are likely. Other places on the spike have already "consumed" the undifferentiated tissue (i.e., it became more spike or flowers), so it's a crap shoot. Often, it is a grotesque clump of growth that does not grow correctly for either.
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