I saw a plant growing in a xeriscape area around early September, that had
very pretty white trumpet shaped flowers that were about 6" long! They were
stunning. The plant also had large irregularly shaped leaves. It was in
northwest Denver. I'm not sure if it was a annual or perennial but it sort of
seemed like a perennial. It was a maybe 3' tall bush.

Does anyone know what it may have been?

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Yours In Liberty, Melissa - Colorado, U.S.A.