Thymus serpyllum aka Wild Thyme

Thymus serpyllum is known as creeping thyme or wild thyme. It belongs to the mint family, Lamiaceae. Its native range spans Europe, western Asia, and northern Africa. Gardeners have grown this plant for centuries. This low, woody perennial forms a mat across the ground. It stays green in mild winters but can look sparse in winter.

Plants reach about 0.17–0.25 feet [0.05–0.08 metres] tall. Their spread reaches about 0.25–1 foot [0.08–0.30 metres]. Creeping stems take root as they spread across the soil. Their tips turn upward above the mat of leaves. The thin, woody stems may look gray or brown. Leaves hide much of the stem growth during summer. Small, oval leaves grow in pairs along each stem. They have rounded tips and may bear fine hairs. Leaf color ranges from blue-green to dull green. Sources differ on scent: NC State describes mint fragrance; UConn reports none.

Tiny flowers open from June through September on upright shoots. Their color ranges from deep pink to purple. Each flower has a tube and two lips. Bees and butterflies visit the blooms for nectar. The plant also hosts common blue and large blue butterflies. Its fruit is a schizocarp with four seed-bearing sections. The dry fruit splits apart when it ripens. The fruit adds little to the plant's garden appeal.

Give this thyme full sun and soil that drains well. It grows well in poor, sandy, gritty, or rocky ground. It tolerates drought and dry to moderately moist soil. NC State lists USDA hardiness zones 4 through 9. Wet soil can cause rot, so drainage matters. Trim stems to check spread and reduce bare, woody growth. Divide mats that have become dense and woody. Grow new plants from seed, cuttings, or divisions. Serious pest and disease problems are few. Spider mites may appear during hot, dry summers.

Use it as low edging or cover for small spaces. It fills gaps between stepping stones and tolerates light foot traffic. It can trail over rocks, ledges, and container edges. Deer and rabbits tend to leave it alone. Though grown mainly for looks, its leaves are edible. PFAF records their use in salads, cooked foods, and tea. It reports no known hazards and lists traditional medicinal uses. Oil from leaves and flowering tops has uses in soaps and perfumes.