Answer: Did the seed packet or catalog from which you got your seeds mention that Bird of Paradise takes 4-6 years to bloom? Otherwise, it sounds like they are doing fine in your apartment. Just so you know, they do require lots of light, but shade from directhot summer sun, average warmth (55-60 degrees in winter), and plenty of water (soil surface should be dry before you water again). The young plants should be repotted each spring, too.
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