The regular orange-petaled form of bird of paradise is a space-hogging cliché, but I happily tend an ever-increasing clump of this rare yellow form, 'Mandela's Gold'.
With "birds," the flowers are the thing. More is definitely more—and more, more often, the ultimate fantasy. I'm never less than thrilled when a bloom spike appears but, as above, in April in the greenhouse? No one but me sees it first-hand.
True, the peak bloom season for bird of paradise is Winter through Spring. For this clump to not begin flowering until April, then, is already an impressive delay. But established clumps can be in flower at almost any time, year round. Perhaps the blooms of a clump that flowers June through September, when the plant has been brought out to the garden, aren't produced as a result of delaying tactics at all. Maybe they're additional spikes, not long-held-back Winter and Spring ones. For Summer flowering, does my "bird" need nothing more than hearty encouragement?