How to grow angelonia
Overview
Angelonia (Angelonia angustifolia) is a herbaceous perennial grown for its upright, spike-like flowers and aromatic foliage. It is a heat-tolerant bedding plant that provides continuous colour from summer through autumn, making it a reliable filler for garden beds and containers.
Varieties
- Angelonia angustifolia 'Serena' — Compact, early-flowering series with pink, white, or purple blooms, ideal for pots and borders.
- Angelonia angustifolia 'Angelface' — Large-flowered, heat-tolerant series with blue, pink, or white blooms; excellent for mass planting.
Soil Preparation
Angelonia prefers slightly acidic to neutral soil (pH 6.0–7.0) with good drainage. Amend heavy clay with compost or coarse sand to improve drainage. Add a slow-release fertiliser at planting for steady growth.
Growing Guide
Plant angelonia in full sun with well-drained soil; space 20–30 cm apart. Sow seeds directly on the surface or lightly cover after last frost, or transplant seedlings at the same depth as their pots. Water regularly to keep soil evenly moist, but avoid overwatering. Pinch out growing tips when young to encourage bushiness. Deadhead spent flowers to prolong blooming.
Sowing
Sow angelonia seeds on the surface of moist seed-raising mix; do not cover as they need light to germinate. Germination takes 10–14 days at 21–24°C. Transplant seedlings when 10 cm tall, spacing 20–30 cm apart. Direct sowing is possible in warm climates after frost risk passes.
Care
Feed angelonia with a balanced liquid fertiliser every 4–6 weeks during active growth. Pinch back young stems to promote bushiness, and deadhead spent flowers to extend blooming. Cut back hard after summer to rejuvenate for autumn growth.
Companion Planting
Angelonia pairs well with petunias, salvias, and lantana for a vibrant summer display. Avoid planting near heavy feeders like tomatoes that may compete for nutrients. Its upright habit complements trailing plants such as verbena or calibrachoa.
Common Pests & Risks
Aphids and spider mites are common on angelonia, especially in hot, dry weather. Control with a strong water spray or insecticidal soap. Whiteflies may also appear; use yellow sticky traps or neem oil. Avoid over-fertilising to reduce pest attraction.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce water and improve soil. Brown leaf edges: low humidity or salt buildup; mist plants and flush soil. Leggy growth: insufficient light; move to full sun. Stunted growth: root-bound in pots; repot or plant in ground. Powdery mildew: poor air circulation; space plants and avoid overhead watering.