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Plant care

Golden Lemon Thyme (Lemon Thyme 'Aureus') care

Thymus citriodorus 'Aureus'

Also called Golden Lemon Thyme, Lemon Thyme 'Aureus'.

RHS H5USDA 6–9Pet-safeIndoor 20–30 cm tall

Watering rhythm

7-14days

Every 7–14 days in the growing season; less in winter

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Light

Direct sun (at least 4-6 hours)

Soil

Light, gritty, free-draining loam

Humidity

30–50%

Temp

-10–30°C

Pet safety

Pet-safe

Mature size

20–30 cm tall

Care at a glance

Light

Most houseplants will scorch where golden lemon thyme thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun (6+ hours) is critical — in shade the golden variegation reverts to plain green and the lemon fragrance weakens significantly. Bright south- or west-facing windowsills work for indoor pots. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 7–14 days in the growing season; less in winter for golden lemon thyme, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water when the top 2–3 cm of soil is dry. The variegated foliage is slightly more moisture-sensitive than straight thyme — drought causes leaf scorch at the gold margins. Avoid waterlogging at all costs.

Soil and pot

Golden Lemon Thyme grows best in light, gritty, free-draining loam. A 50:50 mix of multi-purpose compost and horticultural grit is ideal. Good drainage is non-negotiable. pH 6.0–7.5. In borders, improve heavy soil with grit before planting. 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

Golden Lemon Thyme sits happiest at around 30–50% humidity and -10–30°C (14–86°F). Moderate to low humidity is preferred. The gold-edged leaves can show tip scorch in very dry conditions indoors — mist lightly around (not on) the foliage or use a pebble tray if humidity drops below 30%. If you keep the room above 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 golden lemon thyme sparingly. Apply a half-strength balanced liquid feed (e.g., 10-10-10) monthly from April to August. Avoid high-nitrogen feeds which promote soft green growth that suppresses variegation. No feeding needed in autumn or winter. 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 golden lemon thyme in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Reversion to plain green — Shoots that lose the gold variegation and revert to all-green are genetically more vigorous and will outcompete the variegated growth. Remove fully green stems at the base as soon as they appear.
  • Root rot in wet soil — Soggy or compacted soil causes rapid crown rot, especially in winter. Ensure sharp drainage and, in containers, use a terracotta pot with drainage holes. Never let roots sit in standing water.
  • Legginess with age — Stems become woody and bare at the centre after 2–3 years without pruning. Cut back by up to one-third after flowering each summer to stimulate bushy basal growth and maintain the mound shape.

Propagation

Take 5–8 cm softwood tip cuttings in May–June, avoiding woody stems. Root in gritty compost under a clear cover at 18–20°C. Variegation is maintained through cuttings but not from seed (seedlings revert). Layer low stems in summer for easy propagation. 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

Golden Lemon Thyme is pet-safe. Thymus citriodorus and its cultivars are listed by the ASPCA as non-toxic to dogs and cats. The genus contains no known toxic principles. 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.

Golden Lemon Thyme care — frequently asked questions

What is the common name for Thymus citriodorus 'Aureus'?

Thymus citriodorus 'Aureus' is most commonly called Golden Lemon Thyme, but it is also known as Golden Lemon Thyme, Lemon Thyme 'Aureus'. The names refer to the same species, so care instructions for Golden Lemon Thyme apply identically to anything sold as Lemon Thyme 'Aureus'.

How much light does golden lemon thyme need?

Golden Lemon Thyme grows best in direct sun (at least 4-6 hours). Full sun (6+ hours) is critical — in shade the golden variegation reverts to plain green and the lemon fragrance weakens significantly. Bright south- or west-facing windowsills work for indoor pots.

How often should I water golden lemon thyme?

Water golden lemon thyme every 7–14 days in the growing season; less in winter. Water when the top 2–3 cm of soil is dry. The variegated foliage is slightly more moisture-sensitive than straight thyme — drought causes leaf scorch at the gold margins. Avoid waterlogging at all costs. 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 golden lemon thyme toxic to cats and dogs?

Golden Lemon Thyme is pet-safe. Thymus citriodorus and its cultivars are listed by the ASPCA as non-toxic to dogs and cats. The genus contains no known toxic principles.

What USDA hardiness zone does golden lemon thyme grow in?

Golden Lemon Thyme is rated for USDA zone 6–9 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Golden Lemon Thyme deep-dive guides

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

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Golden Lemon Thyme qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Golden Lemon Thyme is also commonly called Golden Lemon Thyme or Lemon Thyme 'Aureus'.