Grown as an annual in cooler climates, angelonia is grown as a perennial in USDA cold hardiness zone 9 and higher. Clusters of tiny, orchid-like flowers bloom in white, pink, mauve, violet, or purple racemes at the tips of strong stems covered in narrow green leaves. The fruity scent of angelonia is a bonus and is especially strong on warm summer evenings.
Light
Plant angelonia in full sun to provide the energy it needs to bloom continuously. Plants that don’t receive at least six to eight hours of direct sunlight will grow tall and leggy with fewer blooms.
Soil
Angelonia tolerates a wide variety of soils but prefer a soil pH of 5.5 to 6.2. Soil rich in organic matter will reduce watering and fertilizing chores. Plants need good drainage to prevent root rot. If the gardensoil is heavy clay, consider amending the soil to improve its tilth or grow angelonia in a raised bed or container.
Water
Angelonia is quite hardy and will keep blooming through periods of drought. Water when the top few inches of soil feels dry. Supplemental moisture is fine if the plants have good drainage.
Temperature and Humidity
Angelonia thrives in hot summer weather and high humidity. They thrive in the deep South where sultry conditions dominate. Angelonia also fares well in the Southwest with a little extra watering.
Fertilizer
Fertilize your angelonia plants monthly because they are light feeders and too much fertilizer will cause an overgrowth of foliage at the expense of flowers. You can feed plants with a light dose of flower fertilizer at planting time, which will eliminate the need to fertilize again. For the amount to use, follow the product label instructions.
Angelonia Varieties
Here are several varieties of angelonia to consider growing:
‘Angelface® Cascade Blue’ has both height and a cascading habit, giving it a dual role in containers. The ‘AngelMist®’ series acts as a ground cover, reaching only four to ten inches tall but spreading up to 20 inches. Angelonia ‘Serena’ and ‘Serenita’ are the only varieties available to consumers as seeds.
Pruning
Unlike many annuals, angelonia does not require deadheading to promote blooming. However, pinching the plants when they’re young promotes bushier growth.
Propagating
Angelonia is easy to propagate via stem cuttings.
Growing From Seeds
Angelonia seeds are very fine and difficult to handle, so look for pelleted seed, which makes the seeds larger with a clay coating that dissolves after planting. Start angelonia seeds indoors about six weeks before the last frost. Press them into a sterile potting soil, but don’t cover the seeds because light aids germination. Keep seeds moist, and provide bright light and a temperature between 70 and 75 degrees Fahrenheit. Germination will occur in one to three weeks. Space seedlings eight inches apart in the garden.
Potting and Repotting
The constant blooms and tidy, self-cleaning habit of angelonia plants make them ideal for growing in containers. Take advantage of angelonia’s appeal to butterflies and hummingbirds with some pool or patio planters. Large containers, at least 18 inches in diameter, won’t dry out as fast as smaller containers. Pot up your angelonia plants in late spring when evening temperatures are warm. Use a commercial potting soil, which will provide the right acidity and drainage. Angelonia has a small root system and won’t need repotting when grown as an annual. Repot overwintered plants in the spring to refresh the growing medium.
Overwintering
In cooler climates, angelonia is usually grown as an annual but you can also overwinter container plants indoors. When the nighttime temperatures drop below 60 degrees Fahrenheit, bring it inside. Place it near a window where the plant receives bright, direct light and the room temperature is consistently cool, around 65 degrees Fahrenheit. Keep the soil moist by watering it about once a week. When the spring nighttime temperatures are back up in the lower 60 degree Fahrenheit range, move the plant outdoors.
Common Pests
Aphids can be a problem on angelonia, especially early in the season when plants are in their rapid growth phase. A light misting of insecticidal soap twice a week will knock the pests out before they get a chance to deform your plants.
