Several years ago, my great-aunt gave me a flower pot with little green plants sprouting. She said when mature, the plants would produce big trumpet flowers that are "sweet-smelling and night-blooming." She didn't know the exact name, but called them "moonflowers." After a little research on the internet, I found out they are actually "datura" and are desert plants, and thus, very drought tolerant. Here's one of mine:
They easily re-seed themselves each year, and require little care. They aren't fazed when I move the "baby plants" where I want them once they sprout up in the spring. Here's where I planted them along my driveway. At night, they open up and they do smell very good:
They have a funny-looking prickly seed head after the flower drops off, and then at the end of the season, the seed head splits open and spits out the seeds (these next 2 photos are from wiki):
According to the American Botanical Council, datura has a long history of being used in religious ceremonies because it is hallucinogenic, but then too, I think it could be very poisonous so don't eat them!