For genuinely spectacular flowers in September, the houseplant strelitzia takes some beating. With its tufts of flaming orange petals, like the head of a fabulous exotic bird, it’s easy to see why it’s called the bird of paradise plant or the crane flower. Big blue-grey leaves, like those of the banana plant, add to the tropical appeal of this striking plant. Native to South Africa, strelitzias usually flower in spring and summer, although indoor-grown plants may produce flowers at any time of year.