Brugmansias are tropical bushes that produce trumpet-shaped flowers that hang from branches. Because they do not reliably survive temperatures below 40 degrees, grow them as potted plants and summer them outdoors in sunny spots. They'll rest indoors during the winter months and begin to flower again when brought outdoors in spring.
Grow tender tropical perennial brugmansias as potted plants in temperate zones. Plant them in the smallest pot that will accommodate their root system. They like to be crowded in their pots. A full size brugmansia bush will happily grow in a 14- to 16-inch pot.
Grow brugmansias in a mixture of one part compost, one part perlite and two parts of indoor potting soil.
Do not allow their soil to dry out. Water daily during the hot summer months when your brugmansia is outdoors. It may be necessary to water twice daily during the hottest weather of summer. Water less often during the winter months without letting the soil dry out.
Fertilize weekly during the spring and summer months when the brugmansia is in active growth. Use water soluble fertilizer mixed as per the manufacturer's recommended rates of application. The best time to fertilize is when the plant's soil is already moist.
Move brugmansia outdoors in the spring after all danger of frost has past and overnight temperatures stay in the upper 40s or warmer. Harden it off by leaving it in the shade and gradually moving it into bright sun for a longer time each day until it is in full sun during the morning and evening hours. Provide some shade from the noon sun.
Remove 1/3 of the oldest branches each year by cutting them off at soil level. This will train your brugmansia into a small bush. To train it into a tree, use a sturdy stake inserted into the pot for support. Every year in early spring, remove all side branches until the trunk is thee to four feet high. After that, allow it to branch out and form a canopy of leaves.
Bring the brugmansias indoors when temperatures drop into the lower 50s. Grow in a south-facing window during the winter months. Reduce the amount and frequency of water, but do not allow the soil to dry out completely.