How to Grow Thyme — Croft & Covey

Growing Conditions

Thyme is native to the Mediterranean and thrives in full sun, well-draining soil, and low moisture. It is cold-hardy to Zone 4 in good drainage and tolerates drought better than most herbs. Wet winter soil is the primary killer — good drainage is more important than cold protection in Zone 5.

Cold climates: Plant transplants in spring. Established plants are reliably hardy in Zone 5. Excellent drainage is the key factor — raised beds or amended soil in low-lying areas helps. Avoid heavy organic mulch around the crown.

Warm climates: Thyme may be semi-evergreen, providing nearly year-round harvest.

Sowing & Planting

Start from transplants for reliable culinary quality and faster establishment. Can be direct sown ¼ inch deep after last frost, but germination is slow and plants grow slowly in the first year. Space 12–18 inches apart. Plants spread to 12–18 inches wide at maturity.

Care & Maintenance

Water sparingly once established — thyme tolerates drought and dislikes wet conditions. Prune after flowering by cutting back by one-third to prevent woodiness and encourage dense new growth. Replace plants every 4–5 years as they become woody and less productive. No regular fertilizing needed in average soil.

Common Problems

Thyme is one of the most trouble-free herbs in the garden. Root rot in wet or heavy soil is the main risk. Spider mites in hot, dry conditions — occasional. Otherwise essentially pest and disease free.

Harvest

Snip stems from the tips throughout the growing season. Harvest before or just after flowering for strongest flavor. For drying, harvest in late morning after dew has dried — strip small leaves from woody stems after drying. Thyme dries well and retains flavor. Fresh thyme can be refrigerated for 1–2 weeks wrapped in a damp paper towel.

Varieties

Common/English thyme (Thymus vulgaris) is the standard culinary type — reliable, cold-hardy, excellent flavor. Lemon thyme (T. citriodorus) has a bright citrus fragrance and is excellent in fish dishes and desserts. French thyme has a more refined, less earthy flavor than English types. Creeping thyme (T. serpyllum) is low-growing and used as a ground cover — edible but milder. For cold climates and culinary use, common English thyme is the most reliable choice.