I use ladybird beetles, AKA ladybugs in my garden to naturally dispose of aphids and other such pests.. KC MO garden guy over at Midwest Gardening tried some out for his first time not too long ago..
I am very careful as to what ladybugs I introduce into my garden.. I make sure they are the native to North America ones. There are some on the market that sell Asian ones and they can interupt the environment. Kind of like Kudzu and Wisteria down here in GA.
I release about 1500 of them at a time three times throughout the summer. In the morning so they have a chance to settle in.. As for the Angel Trumpet, ONE STINKING bloom. It really didn't like the triple digit temps here.