Growli
Let's go

Plant care

Thyme care

Thymus vulgaris

Also called common thyme, garden thyme.

RHS H5USDA 5-9Pet-safeIndoor 15-30 cm tall and wide

Watering rhythm

10-14days

When the top of the soil is dry, every 10-14 days

Jump to schedule→Get smart reminders in the app

Light

Direct sun (at least 4-6 hours)

Soil

Gritty, free-draining alkaline soil

Humidity

30-50% (outdoor)

Temp

13-26°C

Pet safety

Pet-safe

Mature size

15-30 cm tall and wide

Care at a glance

Light

Aim for at least 4-6 hours of direct sun on the leaves. 6+ hours of direct sun. Shade reduces essential oil content and flavour. If your only bright window faces south, that's perfect for thyme — same window any aroid would fry on.

Watering

Watering thyme: when the top of the soil is dry, every 10-14 days. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Drought-tolerant once established. Avoid overhead watering — wet leaves invite rot.

Soil and pot

Thyme grows best in gritty, free-draining alkaline soil. pH 6.5-7.5. Add grit or sand to heavy soils. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Thyme sits happiest at around 30-50% (outdoor) humidity and 13-26°C (55-80°F). Prefers dry air. If you keep the room above 13 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed thyme sparingly. Almost none required; an annual top-dress with compost is plenty. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on thyme in the Growli community. Where a problem matches one of our diagnostic guides, click through for the full step-by-step recovery plan written for thyme specifically.

  • Woody bare centres — Plants exhaust themselves in 4-5 years; replace from cuttings.
  • Yellow leaves after winter — Wet feet; lift and divide into grittier soil.
  • Powdery mildew — Improve air movement and avoid overhead watering.
  • Loss of flavour — Too much shade or over-fertilising.

Companion plants

Thyme pairs well with Cabbage, Brassicas (deters caterpillars), and Strawberries. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Softwood cuttings in spring or layering established stems. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Thyme is pet-safe. Thyme is listed by the ASPCA as non-toxic to cats and dogs. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Thyme care — frequently asked questions

What is Thyme?

Thyme (Thymus vulgaris) is a culinary herb with a woody low-growing subshrub or mat growth habit, reaching 15-30 cm tall and wide at maturity. Thyme is a low-growing Mediterranean herb with aromatic leaves used in cooking. It loves sun and sharp drainage and dislikes wet winter soil.

How much light does thyme need?

Thyme grows best in direct sun (at least 4-6 hours). 6+ hours of direct sun. Shade reduces essential oil content and flavour.

How often should I water thyme?

Water thyme when the top of the soil is dry, every 10-14 days. Drought-tolerant once established. Avoid overhead watering — wet leaves invite rot. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is thyme toxic to cats and dogs?

Thyme is pet-safe. Thyme is listed by the ASPCA as non-toxic to cats and dogs.

What USDA hardiness zone does thyme grow in?

Thyme is rated for USDA zone 5-9 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Thyme deep-dive guides

Every aspect of thyme care, each with its own calibrated guide:

Featured in these plant shortlists

Thyme qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Thyme is also commonly called common thyme or garden thyme.