How to grow african marigold
Overview
African marigold (Tagetes erecta) is a fast-growing, upright annual grown for its large, pom-pom-like flower heads in yellow and orange. It thrives in heat and full sun, providing bold seasonal colour and filling gaps in garden beds.
Varieties
- Crackerjack — Tall, vigorous with large orange and yellow blooms, excellent for cut flowers.
- Inca — Compact, early-flowering series with dense double flowers in gold and orange.
Soil Preparation
Prefers well-drained, moderately fertile soil with pH 6.0–7.5. Add compost before planting. Avoid heavy clay or waterlogged sites.
Growing Guide
Sow seed 5 mm deep in punnets or direct after frost. Space 30–40 cm apart in well-drained soil. Pinch out tips at 15 cm to encourage branching. Stake tall varieties if exposed to wind. Deadhead weekly to prolong flowering.
Sowing
Sow 5 mm deep in seed-raising mix. Germinates in 5–7 days at 20–25°C. Direct sow after frost or transplant when 10 cm tall.
Care
Feed every 4–6 weeks with a balanced liquid fertiliser. Pinch out early tips to promote bushiness. Remove spent flower heads regularly to extend bloom.
Companion Planting
Plant with zinnias, cosmos, and sunflowers for a vibrant summer bed. Avoid near beans and brassicas as marigold root exudates may suppress their growth.
Common Pests & Risks
Watch for aphids on new growth, spider mites in dry spells, and caterpillars on foliage. Control with insecticidal soap or neem oil. Slugs can damage young seedlings.
Harvesting
Harvest flowers when fully open and petals are firm. Cut stems in the morning after dew dries. Use fresh in bouquets or dry for petals.
Troubleshooting
Yellow leaves: overwatering or poor drainage. Reduce water. Brown leaf edges: heat stress or low humidity. Mulch and mist. Stunted growth: cold soil or late planting. Wait for warmth. Powdery mildew: improve air circulation. Remove affected leaves.