Angel trumpet is native to Central and South America. In its natural habitat the plant will grow to 30 feet in height. In the home landscape, angel trumpet plants normally reach heights of 8 to 15 feet. The angel trumpet has large pink, white, yellow or salmon-colored flowers. The trumpet-shaped flowers hang down from the branch, sometimes nearly a foot long. These plants are propagated by softwood stem cuttings and sold as small plants. They will not tolerate temperatures below 40 degrees F. and must be brought indoors for the winter in colder areas.
Keep the plant in a sunny window when you first purchase it until all threat of frost is past. Then place it outdoors in the shade for a few hours, gradually moving it to a sunnier location over the course of several days. These plants will thrive in full sun, but some afternoon shade in very warm planting zones will keep the flowers from fading.
Keep the soil moist at all times during the spring and summer. Angel trumpet is not very drought tolerant. If left too dry the plant may recover, but you will lose any flowers or buds on the plant.
Fertilize the plant with a water-soluble complete fertilizer every two weeks throughout the growing season. Follow manufacturer directions regarding the amount to apply.
Pinch off dead flower heads to encourage new floral growth.
Re-pot the angel trumpet at the end of the summer into a 12- to 15-inch flower pot with drain holes. Use a well-draining potting soil with no fertilizer mixed in.
Bring the plant indoors in the fall and place in a sunny window. Water only when the surface of the soil is dry. This will be the plant's resting time. It can be gradually placed back outdoors in the spring.