How to grow thyme
Overview
Thyme is a perennial herb from the Mediterranean, prized for its aromatic leaves and culinary versatility. It is grown for continuous harvests of fresh sprigs, and thrives in warm, dry conditions with excellent drainage.
Varieties
- Common thyme — The standard culinary variety, reliable and hardy.
- Lemon thyme — Citrus-scented, good with fish and chicken.
- Silver thyme — Variegated leaves, ornamental and edible.
Soil Preparation
Thyme prefers a free-draining, sandy or loamy soil with pH 6.5–8.0. Add lime if soil is acidic. Improve drainage with gravel or coarse sand before planting. Avoid rich, wet soils.
Growing Guide
Plant thyme in full sun in a free-draining, slightly alkaline soil (pH 6.5–8.0). Space 30–40 cm apart; avoid heavy clay or waterlogged sites. Sow seed 1–2 mm deep in spring or early autumn, or start from cuttings. Do not overwater—allow soil to dry between drinks. Pinch out tips to encourage bushiness.
Sowing
Sow seed 1–2 mm deep in seed trays, 20–25 cm apart. Germination takes 14–21 days at 18–22°C. Direct sow in spring or autumn, or transplant after frost. Cuttings root faster.
Care
Feed lightly in spring with a balanced organic fertiliser (e.g., seaweed or fish emulsion). Prune after flowering to maintain shape and remove dead stems in early spring. Do not over-fertilise—it reduces flavour.
Companion Planting
Thyme is excellent near brassicas (cabbage, broccoli) to repel cabbage moth, and near strawberries to deter slugs. Avoid planting near mint or other aggressive spreaders that compete for root space.
Common Pests & Risks
Thyme is generally pest-free, but root rot (Phytophthora) can occur in wet soil. Aphids may appear on new growth in humid weather; blast off with water or use neem oil. Spider mites can attack in dry spells—increase humidity.
Harvesting
Harvest thyme sprigs once the plant is 15–20 cm tall, cutting just above a leaf node. Pick in the morning for best flavour. Regular picking keeps plants compact and productive.
In the Kitchen
Use fresh or dried sprigs in stews, roasts, and salads. Store fresh in a damp paper towel in the fridge for a week. Dried thyme keeps for months in an airtight jar.
Troubleshooting
Yellow leaves: overwatering or poor drainage—reduce water and improve soil. Brown leaf tips: underwatering or heat stress—water deeply in dry spells. Leggy growth: too little sun—move to full sun. Stunted growth: heavy soil or root rot—repot in gritty mix. No flowers: over-fertilising with nitrogen—use balanced feed.