If you are growing your Angel's Trumpets in the garden, they should be planted in a sheltered area in light, fertile, well-drained soil. In most areas, they will grow and flower best in full sun, but in hot, dry climates they will appreciate light shade or mottled sunlight, especially during hot, mid-day sun. A heavy layer of mulch will help to keep the roots cool and help to preserve moisture. Brugmansia plants need a lot of water when they are actively growing, or they may quickly show signs of stress like wilting or pale foliage, and they may become susceptible to attacks from spider mites or whiteflies. New growth should be protected from snails and slugs. Feed monthly from spring until early fall, using a good, all-purpose fertilizer.
Brugmansias are only hardy in USDA zones 9-12. In colder regions, plants that are grown in the ground must be dug up in early fall, before the first frost. Keep as much soil around the roots as possible. Store them in a cool (50°) area, and keep them fairly dry through the winter.