The angel trumpet is a beautiful flower with a distinct growing quality--its long, delicate blossoms only open up at night, and when they do, they release a heavy, sweet scent. The angel trumpet’s nocturnal behavior makes it ideal for a night garden in a warm climate. In growing zones 9 and above, the angel trumpet will bloom year round, but only if adequately fertilized and cared for. These night bloomers may seem exotic, but they have the same fertilization and care needs as most other plants, whether grown in the ground or a pot.
Spread a 15-5-10 granular fertilizer over the roots of angel trumpets grown in the ground once weekly. Follow the manufacturer's instructions for plants of your angel trumpet's approximate size.
Water the angel trumpet's soil to help the fertilizer reach the angel trumpet's roots.
Pour a water-soluble 17-17-17 fertilizer over the soil of potted angel trumpets once weekly. Follow the manufacturer's instructions for plants of your angel trumpet's approximate size.
Stimulate your angel trumpet's growth by giving it a dose of ammonium nitrate in early spring and late summer. Mix 3 tablespoons of 34-0-0 ammonium nitrate into 2 gallons of water and pour it over your angel trumpet's roots.
Stop fertilizing your angel trumpet if it goes dormant in the winter. Resume fertilization in the spring when it breaks its dormancy.