Inca is a hybrid species of angel's trumpet (Brugmansia 'Inca suni') which flowers continuously year-round while the plant continues growing. Most species of angel's trumpets go through a bloomless period while the plant grows. Inca angel's trumpets grow best in USDA planting zones 9b through 11. Plants reach up to 20 feet in height planted in the ground and produce a mass of scented, large, yellowish peach, trumpet-like flowers, which dangle from the limbs. Gardeners living in cooler regions can grow Inca angel's trumpets inside containers, as container-grown Incas only reach approximately 6 feet in height at maturity and require winter protection.
Select a location in your landscape receiving sun for at least five hours each day. Inca angel's trumpets have the best flowering effect when they receive the maximum amount of sunlight during the day, according to the University of Florida. Plants will tolerate growing in partial sun conditions but may not be as bloomy.
Clear the planting area of unwanted grass or other vegetation. Leave an area approximately 3 feet in diameter vegetation-free while the Inca angel's trumpet is growing there. The plant has thin bark and this will cut down on the possibility of lawn equipment damaging it.
Grow the Inca angel's trumpet in a well-draining soil medium that is slightly acidic and amended with humus. Work the humus into the planting site to a depth of approximately 12 inches.
Plant the Inca angel's trumpet in a hole that is two to three times wider than the Inca angel's trumpet's root ball, leaving the hole no deeper than the tree is presently growing inside the planting container. Loosening the surrounding soil allows the angel's trumpet's feeder roots to spread throughout the soil easily.
Apply water to the planting hole, allowing it to fill up before placing the root ball into it. Place the trumpet tree's root ball into the planting hole once the water has seeped into the soil.
Backfill the planting hole with soil halfway and tap it down with your foot to release air pockets. Continue backfilling the hole until filled and firm the area up with your foot again.
Apply a layer of mulch around the base of the trumpet tree, allowing it to remain approximately 3 to 4 inches from the trunk. Trumpet trees are heavy drinkers and the mulch will help the planting site retain moisture as well as cut down on unwanted weed growth.
Water the Inca angel's trumpet after planting and continue with daily doses of water for the first three weeks as the tree establishes itself. Water the tree regularly to keep the area moist. If the leaves begin to wilt, the tree requires water.
Prune only to remove dead or crossing branches, or to maintain a certain shape or size. Inca angel's trumpet requires little pruning.