I don't mean to be picky, guys, but the red things are not flowers;
they are leaves. The flowers are small yellow bud-like things of no
beauty.

When I lived in Los Angeles, I had two poinsettia bushes that were as
high as the eves of the house. Each plant produced many dozens of red
leave sets each winter. When the weather was right, some of them would
last into June. But one year we had a hard freeze, and the plants died.