The official name? Did they win a contest or something?
The names of the two genera commonly called "Angel Trumpet" are Datura and
Brugmansia. Note the first letter of the names of genera is always
These are probably Datura, instead of Brugmansia. Brugmansia is not a short
plant. Either way, I doubt these are hardy in Denver, sans seeds falling and
finding their way to germinate once soil warms.
If the flower hangs down, it's Brugmansia, if the flower points upward, it's
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