Datura flowers open up at night-blooming on rounded plants up to 3 feet tall. Newer varieties come in a variety of flower and leaf foliage. Other names of the non-cultivated variety are Angel Trumpet, devil trumpet, and jimsonweed (which is a weed found in pastures and are poisonous to cattle and horses).
I have tried for several years to start indoors without any success. This spring I placed the planted seed container in the refrigerator for a couple of weeks, took them out, and success!
The older white single flower variety naturalizes easily. Coming mainly from Mexico and Central America were used as a sacred plant 3000 years ago. Some varieties originated in Asia. All datura plants are very toxic and hallucinogenic. This makes them resistant to insects, deer, and rabbits.
Once started, they grow easily in full sun and drought tolerant once established. They make great specimen plants where you can enjoy the fragrance of the flowers. Datura grows 3 feet high and 2 to 3 feet across, so give them space.