I cultivate different forms of BOP, and all of them are very easy to grow. The BOP I like most is S. reginae "Mandela`s Gold" and S. juncea (see pic below). As far as I know, all forms need a cold period to bloom.
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I've seen people grow the White Birds, as they are known in New Orleans, in big containers in pots. They generally do not flower. I would think at some point they would.
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Someone from a nursery told me that S. nicolai needs to be at least 2,5 m in height before it`ll bloom.