Kaffir Lime (makrut lime) care

Light

Kaffir Lime needs sun on the leaves, not just bright ambient room light. Needs bright light, ideally full sun or at least 6 hours of direct light; indoors place at the sunniest south-facing window or under a grow light. Insufficient light causes weak growth and leaf drop. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water kaffir lime water when the top 3-5 cm of soil is dry, roughly every 5-10 days depending on warmth and pot size. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Likes evenly moist but never waterlogged soil; let the surface dry slightly between waterings. Reduce watering in winter when growth slows, and use tepid, low-alkalinity water where possible.

Soil and pot

Kaffir Lime grows best in free-draining, slightly acidic citrus or loam-based mix. Requires a gritty, fast-draining medium with a pH around 6.0-6.5; a dedicated citrus compost or loam-based mix amended with grit and bark is ideal. Sharp drainage is essential to avoid root rot. 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

Kaffir Lime sits happiest at around 50-70% humidity and 15-30°C (59-86°F). Appreciates moderate to high humidity, especially indoors where central heating dries the air and can cause leaf drop. Group with other plants or use a humidity tray over winter. If you keep the room above 15 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 kaffir lime sparingly. Feed regularly through the growing season with a dedicated citrus fertiliser, typically a high-nitrogen summer formula switched to a winter citrus feed in the cooler months; citrus are hungry and prone to nutrient deficiencies if underfed. 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 kaffir lime in the Growli community. Each is annotated with the most common cause so you know where to start.

• Leaf drop from cold or overwatering — Sudden chills, drafts, or soggy roots cause leaves to yellow and drop. Keep above 10°C, away from cold windows and heaters, and let the soil surface dry between waterings.
• Nutrient deficiency (yellowing leaves) — Interveinal yellowing signals iron, magnesium, or nitrogen shortfall common in container citrus. Feed with a balanced citrus fertiliser containing micronutrients through the growing season.
• Scale and spider mites indoors — Overwintered indoors it is prone to scale insects, mealybugs, and spider mites in dry air. Inspect regularly and treat with horticultural soap or oil at the first sign.
• Root rot in heavy soil — Slow-draining mixes and overwatering cause root rot. Always use a gritty citrus compost and a pot with ample drainage holes.

Propagation

Usually propagated from semi-hardwood cuttings taken in summer with bottom heat, or by air-layering, both of which keep the plant true to type. Seed-grown plants are slow and variable. Grafting onto rootstock is used commercially for vigour and disease resistance. 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

Kaffir Lime is toxic to pets. ASPCA classifies Citrus species (e.g. lime, Citrus aurantifolia) as toxic to cats, dogs, and horses; the toxic principles are essential oils and psoralens, which can cause vomiting, diarrhoea, depression, and skin photosensitivity/dermatitis, particularly from the peel, leaves, and stems. As a Citrus species, makrut lime carries the same risk. 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.

Kaffir Lime deep-dive guides

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

• Kaffir Lime watering schedule
• Kaffir Lime light requirements
• Best soil mix for kaffir lime
• Kaffir Lime fertilizing guide
• When to repot kaffir lime
• How to propagate kaffir lime
• Kaffir Lime growth rate & size
• Kaffir Lime cold hardiness
• Kaffir Lime temperature & humidity
• Is kaffir lime toxic to cats & dogs?
• Is kaffir lime toxic to cats?
• Is kaffir lime toxic to dogs?

Featured in these plant shortlists

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

• Best fragrant houseplants — Indoor plants with scented flowers or aromatic foliage — greenery you can smell, selected from our care library.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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Kaffir Lime is also known as kaffir lime, makrut lime, and Thai lime.

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