Ben,
If you are sure that the seed packett you showed is what you have your
Datura is a annual plant unlike the brugmansias which are perennial.

If your Dat got a late start in your growing season and never flowered
for you ........ with a little LUCK she just may bloom for you this
summer.
Hope you get seeds . The prickly round pod full of seeds is ready to
harvest when it is totally brown , dry and splitting open.
Dats are grown as yearly annuals.

Datura correctly are referred to as Devil's Trumpet because they face
upward from below ;-)
Brugmansia are correctly referred to as Angel's Trumpets as most of
them hang down ( in varying degrees) as if from the heavens.
I hate the way seed companies refuse to acknowledge this fact and mess
with every newbies mind that reads their junk.

Best of Luck
Cheers from Here,
Shirley