Answer: Since you've successfully rooted new plants from your original Angel's Trumpet and they are doing well, I suspect that the parent plant is suffering from some kind of stress - perhaps soil or sun exposure. I'd dig it up and inspect the soil. Make sure it drains well (add some organic matter to help loosen it up if necessary) and then replant your Angel's Trumpet. In hot summer areas (Corona included) some shade from hot afternoon sunshine will reduce stress in the plant. If you think reflected heat might be an issue, you may want to move the plant rather than improving the soil and then replanting in the same spot. If you're looking for a spectacular vine for hot summer sun, consider planting Campsis radicans in the spot. While the flowers are slightly different than those of Angel's Trumpet, they are just as striking.
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