The "recipe" to bloom H.papilio is, to keep it indoors as from October at a bright and warm place, and to move it outdoors as from May. A bunch of new leaves will appear in October, and the bloom - one seldom 2 scapes in succession - will follow, indoors, some weeks later. This recipe applies ONLY if the current husbandry is not rewarded with reliable bloom in the long term. There is always some gardeners, who obtain bloom despite another regimen. My recipe is not for them.