Daturas are beautiful, but they can become weedy if you leave them to their own devices. When I was a kid, we used to have a bunch of them growing in front of our house, and they'd re-seed themselves to the point of weediness each year. We ended up getting rid of them because they'd crowd out everything else, and because they're so toxic (my parents decided to take action when they learned about this).
But that's a nice plant. I'm used to seeing the ones with single flowers, so it's unusual for me to see one with double flowers.