I'm hoping you live in the mojave desert of Southern California or Africa, because those are the only two places in the world that they grow.
Seeding: The seeds require 15C/60F or warmer temperature for germination. So, it is recommended to seed them between the spring to the autumn, when it is warm. Cover the seeds with 1/8 to 1/4 inches of soil. It takes 11 to 21 days to germinate. Seed them in a container with holes at the bottom, and place it in a bowl or a saucer filled with water to keep them moist, until they germinate.
Location: Because they like sunlight, it is recommended to keep them near a sunny window or on the balcony. Young plants like warm temperature at 25C/87F or higher.
Watering: Though high moisture is required until they germinate, they prefer to be dry after the germination.
Transplanting: They can be transplanted when they are as high as 1 and 1/4 inches.
I have several in my yard and when they bloom they are beautiful. Some of the rain we got this winter killed one of them though, and some jerk tagged one at the end of our street.