How to grow thyme — common, lemon, creeping varieties

How to grow thyme — common, lemon, creeping varieties

Thyme (Thymus genus) is one of the lowest-maintenance herbs you can grow. Native to the dry hillsides of the Mediterranean, it tolerates drought, poor soil, and neglect — what it cannot tolerate is wet feet and heavy clay. Get the drainage right and a single plant lasts 4-5 years before it needs replacing. The Royal Horticultural Society's Award of Garden Merit (AGM) list includes several thyme cultivars proven in UK trials, and most are widely available in US garden centres too.

Set thyme pruning reminders in Growli: Add the variety to the Growli app and the morning briefing tells you when to give the post-flower haircut that keeps the plant compact.

Thyme varieties — what to grow

There are dozens of Thymus species and cultivars. The four that earn a place in most gardens:

Common thyme is the classic culinary form — a bushy, evergreen sub-shrub up to 30cm tall with small grey-green leaves and pale pink flowers in early summer. The RHS recommends the cultivar 'German Winter' for reliable UK hardiness.

Lemon thyme (T. citriodorus) carries a bright lemon scent on top of standard thyme flavour. It pairs especially well with roast chicken, fish, and citrus desserts. The variegated 'Silver Queen' is decorative as well as culinary.

Creeping thyme (T. serpyllum) grows 2-4 inches tall and spreads to form a fragrant mat. It tolerates light foot traffic and is the right thyme for planting between paving stones or as a lawn alternative in poor dry soil. Flavour is milder than common thyme but the leaves are edible.

UK retailers — variety availability

• RHS Plants, Crocus, Hayloft, Sarah Raven carry the full range including AGM cultivars.
• Garden centres reliably stock common thyme, lemon thyme, and creeping thyme in 9cm pots from April.

US retailers — variety availability

• Burpee stocks common, lemon, and creeping thyme starter plants.
• Mountain Valley Growers, Richters Herbs, Companion Plants carry unusual cultivars including caraway, orange-balsam, and woolly thyme.

Soil — drainage is everything

Thyme is a Mediterranean herb that grows wild on dry stony slopes. Replicate that:

• Texture: Free-draining. Heavy clay kills thyme over winter when waterlogged roots rot.
• Amendments: Mix coarse horticultural grit, perlite, or sharp sand into your potting mix at 30% by volume.
• pH: Slightly alkaline, 6.5-7.5. Add a pinch of garden lime in acidic soil.
• Fertility: Lean. Rich soil produces lush growth with weak flavour. Skip the compost.

If your garden soil is heavy clay, grow thyme in a pot or a raised bed with a free-draining mix. Container thyme thrives in terracotta pots, which wick moisture out of the soil between watering.

Sun

Full sun, always. At least 6 hours of direct sun per day, ideally 8+. Thyme tolerates light shade but produces fewer essential oils, which means weaker flavour. South-facing positions work in both UK and US. In hot southern US gardens (zones 9-10) light afternoon shade in summer prevents leaf scorch.

Planting

Thyme is slow from seed and faster from a transplant or cutting:

From transplant (recommended):

1. Plant after the last frost — late April in southern UK and US south, late May further north.
2. Space plants 12 inches apart; creeping thyme 8-10 inches apart for ground cover.
3. Set the crown level with the soil surface. Burying the crown causes rot.
4. Water in once, then leave the plant alone for a week.

From seed:

1. Surface-sow indoors 8-10 weeks before last frost.
2. Cover seeds lightly with vermiculite — thyme seeds need light to germinate.
3. Keep at 20-22°C; germination in 14-21 days.
4. Pot up to 4-inch containers when seedlings have true leaves.
5. Harden off before transplanting outdoors.

From cutting:

Take 3-inch softwood cuttings in late spring. Strip lower leaves, dip in rooting hormone, and pot up in a 70/30 grit-to-potting-mix blend. Roots form in 4-6 weeks.

Watering

Thyme is drought-tolerant once established. Overwatering kills more thyme plants than any pest or disease.

• First year: Water weekly during dry spells.
• Established plants in beds: Rainfall is usually enough. Water during prolonged drought.
• Container thyme: Water only when the soil is completely dry — typically every 5-7 days in summer, every 10-14 days otherwise.

A wilting thyme plant has either run out of water entirely or, more often, is suffering from root rot caused by too much water. Check the soil before adding more.

Pruning — the post-flower haircut

Thyme is a sub-shrub: each stem becomes woody at the base over time, and old woody stems stop producing fresh leaves. To keep the plant productive:

1. Wait until the plant finishes flowering (usually mid to late summer).
2. With sharp scissors, shear the plant back by about a third.
3. Cut into green growth, never into the bare woody base — thyme rarely resprouts from old wood.

This single annual shearing keeps the plant bushy for 4-5 years. Without it, the centre opens up, becomes woody, and stops producing.

For culinary use, cut individual stems whenever needed throughout the season. Strip the leaves by running your fingers down the stem from tip to base.

Winter care

Common thyme is hardy to USDA zone 5 (UK H5) — it survives most UK winters and US winters down to roughly -20°C without protection.

• In-ground plants: No protection needed in zones 5-9 / mainland UK.
• Container plants in cold zones: Move pots to a sheltered spot against a south-facing wall, or sink into a garden bed for winter.
• Lemon thyme is slightly less hardy — protect with horticultural fleece in zones 4 and below.

Avoid heavy winter mulching — wet mulch sitting on the crown causes rot faster than cold air ever will.

Pests and problems

Thyme is one of the most pest-resistant culinary herbs. Watch for:

• Root rot — soggy soil; the plant wilts, blackens at the base, and dies. Improve drainage immediately or replant elsewhere.
• Spider mites on indoor thyme — fine webbing, stippled leaves. Rinse with water. See houseplant pests.
• Aphids on new growth — uncommon but possible. Squash or spray. See aphids on plants.
• Woody bare-centre plants — not a disease, just age. Replace plants every 4-5 years.

Pet safety — thyme and pets

The ASPCA classifies common thyme (Thymus vulgaris) as non-toxic to dogs, cats, and horses. A pet nibbling fresh thyme leaves is safe. Concentrated thyme essential oil is a different story and should not be used near pets — cats in particular cannot metabolise concentrated phenols.

If a pet ingests an unusually large amount of any plant material and shows symptoms, call the ASPCA Animal Poison Control Center at (888) 426-4435 or your vet.

Companion planting

Thyme is one of the best companion plants for vegetable gardens. The strong essential oils repel cabbage worms, cabbage loopers, and whitefly when planted near brassicas (cabbage, broccoli, kale, cauliflower). Thyme also attracts hoverflies and parasitic wasps that prey on aphids.

Good companions for thyme itself: rosemary, oregano, sage, lavender — all share lean dry soil and full sun. Avoid planting thyme near moisture-loving herbs like mint, parsley, or basil — they need different watering regimes and will out-compete or get out-competed.

Thyme also makes a useful low-growing edge for raised beds. Creeping thyme along a bed border releases scent when brushed and tolerates the light foot traffic of garden maintenance.

Culinary use

Thyme is one of the four pillars of French cooking (along with bay, parsley, and rosemary). Quick ideas:

• Common thyme: Soups, stews, roast lamb, slow-braised meats, bouquet garni.
• Lemon thyme: Roast chicken, baked fish, lemon-thyme shortbread, herb butter.
• Creeping thyme: Light sprinkle on roast vegetables, infused honey.

Thyme dries exceptionally well — hang small bundles upside down in a dry airy room for 2 weeks, then strip the leaves into a sealed jar. Dried thyme keeps full flavour for about a year.

Related articles

• How to grow basil — the warm-season counterpart
• How to grow rosemary — another Mediterranean shrub
• How to grow oregano — same Mediterranean conditions
• Types of herbs — Mediterranean vs moisture-loving vs annual
• Drought-tolerant houseplants — same low-water principle applied indoors

Reviewed and updated by the Growli editorial team. Pet-safety claims sourced from the ASPCA Animal Poison Control Center; cultivar trial data via the Royal Horticultural Society. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.