How to Grow and Care for Angelonia (Summer Snapdragon)

Often called summer snapdragons, angelonias (Angelonia angustifolia) produce snapdragon-like blooms on upright spikes but with a key advantage—they flower continuously through summer's heat. These tough, fast-growing plants thrive in USDA zones 9-11 as perennials and as annuals elsewhere, tolerating heat, humidity, and drought with ease.

Plant Characteristics

Angelonias reach about 2 feet tall with compact cultivars available. Their glossy, serrated leaves and fragrant foliage add appeal even when not in bloom. Labiate (two-lipped) flowers appear on terminal spikes in shades of white, pink, blue, purple, and bicolors. The genus includes roughly 30 species in the Plantaginaceae family.

Popular Cultivars

• Angelface: Blush-purple flowers, heavy blooming, compact habit
• Serena series: Exceptionally long bloom period, 12-14 inches tall, available in white, purple, lavender, and lavender pink—plus they grow from seed
• Serenita series: Similar to Serena but more compact

Propagation Techniques

From Seeds (Serena Series)

Start seeds indoors 2-3 months before last frost. Sow in well-drained soil (pH 5.0-6.0) at 70-75°F (21-24°C) under low light until germination (about 2 weeks). Then provide bright light. Transplant after frost danger passes; plants bloom within 3 weeks.

Stem Cuttings

Take tip cuttings from non-patented varieties. Root in well-drained medium with bottom heat (70-75°F) and high humidity. Roots develop in approximately 2 weeks under ideal conditions.

Root Division

Dig up mature plants, divide root clumps, and pot in 1-gallon containers. Keep indoors in a warm, sunny spot during winter, cutting back when blooming pauses. Water sparingly—only when soil dries completely. Move outdoors after last frost.

Growing Requirements

• Sunlight: Full sun (8+ hours) for best blooms; tolerates partial shade. Avoid full shade.
• Spacing: 10-12 inches apart in cool regions; 18-20 inches in warm areas for good air circulation.
• Soil: Fertile, well-drained, pH 5.6-6.5. Amend with compost before planting.
• Pinching: Pinch stem tips 8-10 days after transplanting to encourage branching. Prune mid-summer if blooming pauses to stimulate a new flush.
• Watering: Keep moist until established. Then water only when soil dries completely. Containers and hot climates need more frequent watering.
• Fertilizing: Light monthly feeding with balanced fertilizer. Avoid over-fertilizing (causes foliage at expense of flowers). Don't fertilize in winter.

Overwintering

In cold regions, dig plants in fall and containerize for indoor growing. In mild winters (zone 8+), mulch heavily with pine straw in fall. Plants may survive if temperatures don't drop too low.

Pest and Disease Management

Angelonias are notably resistant to most pests and diseases. Occasional aphids or whiteflies can be treated with appropriate insecticides. Watch for Angelonia Flower Break Virus (AnFBV)—a carmovirus causing flower break and leaf mottling. Infected plants must be destroyed as there's no cure.

With their carefree nature and nonstop summer color, angelonias are perfect for busy gardeners seeking reliable performance in challenging conditions.