I think some people are confusing datura with moon flower vine. Datura is jimson weed, also called devils trumpet and angels trumpet. Pretty sure both would be annuals. Datura is same family as belladona. Its seed pod looks like a torture device, in my opinion.
When my grandma gave me some seed, she called them moon flower, but that was a misplaced common name.
These datura I have are not the same as the true
Moon Flower vine. The blooms look so much alike, so I think that's where the confusion comes from. Then there's Angel's Trumpets which also look similar, but are in the genus
brugmansia. I remember when I first joined TEG many moons ago, a fella explained to me that the way to tell those two apart is that angels trumpet downward from heaven, and the devils are trumpeting upward. Both are in the solanaceae family or "nightshades", so closely related. I think the brugmansia are so much prettier, since they come in different colors and look to me like an elegant dancer's skirt. I also find Jimson weed (datura) popping up in my garden a couple times each year too and it looks very much like the cultivated datura, but not as showy.
Yeah, they're technically annuals for most areas, but in warmer climates they can be a perennial. I have had the roots survive where I've planted them up against the eastern side of the house where they get some shelter from the winter winds. Elsewhere they usually don't come back though. Those pods are evil little things! I am usually running barefoot or in sandals and have stepped on them a couple of times. Almost as bad as stepping on a chestnut burr.
The brugmansia don't have spikey seed pods. I think I'd rather grow those! But with both being poisonous, I probably shouldn't be growing them at all. You know how kids like to play with flowers and make concoctions and stuff. The burrs on the datura turned me off of them several years ago, but they reseed so vigorously they always come back on their own.
Does anyone know if it's a bad idea to put them in your compost? I've been tossing the plants over the hill, because I worry about the chickens getting poisoned as they scratch about the compost. I figured better safe than sorry.