Finger Lime (citrus caviar) care

Light

Finger Lime needs sun on the leaves, not just bright ambient room light. Full sun, 6-8 hours daily, ripens fruit and intensifies pulp colour. In hot inland climates light afternoon shade prevents scorch on young growth; under glass, give it the brightest south-facing position. 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

Outdoor finger lime crops want when the top 3-4 cm of soil is dry, roughly every 5-10 days in growth. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. Damp = wait a day; dust-dry = water deeply at the base of the plant. Keep evenly moist but never waterlogged; citrus hate wet feet. Reduce watering in winter to prevent root rot, allowing the surface to dry more between drinks. Container plants dry out faster and need closer monitoring.

Soil and pot

Finger Lime grows best in free-draining, slightly acidic loam. Target pH 6.0-6.5. A citrus or loam-based potting mix amended with grit and composted bark suits containers. Sharp drainage is essential; heavy clay must be lightened with grit or planted into a raised bed. 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

Finger Lime sits happiest at around 40-60% humidity and 10-30°C (50-86°F). Tolerates average outdoor humidity well. Indoors, dry winter air from central heating can encourage leaf drop and spider mite; group plants or use a humidity tray rather than misting fruit-bearing wood. If you keep the room above 10 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 finger lime sparingly. Feed with a high-nitrogen citrus fertiliser fortnightly from spring through late summer, switching to a winter citrus feed in the cool months. Watch for magnesium and iron deficiency (interveinal yellowing) and correct with chelated micronutrients. 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 finger lime in the Growli community. Each is annotated with the most common cause so you know where to start.

• Spider mites — Thrive on dry, dusty foliage indoors and over winter; check leaf undersides for stippling and fine webbing and raise humidity.
• Citrus leaf miner — Silvery serpentine trails distort new flushes; prune affected tips and protect tender spring growth in warm climates.
• Magnesium/iron chlorosis — Interveinal yellowing on older or new leaves signals nutrient lockout; correct pH and apply chelated micronutrients.
• Cold damage — Frost scorches leaves and can kill stems below about -2°C; move containers under cover before the first frost.

Propagation

Usually grafted onto Trifoliata or Flying Dragon rootstock for vigour and earlier fruiting. Semi-hardwood cuttings can be rooted under mist with bottom heat but are slow; seed-grown plants are variable and take many years to fruit. 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

Finger Lime is toxic to pets. The ASPCA lists Citrus species (including limes) as toxic to dogs, cats and horses; the toxic principles are essential oils and psoralens concentrated in the peel, leaves, stems and seeds. Ingestion can cause vomiting, diarrhoea, depression and, with skin contact, photosensitive dermatitis. As a Microcitrus (a true citrus relative), treat the finger lime the same way. 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.

Finger Lime deep-dive guides

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

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

Related guides

Finger Lime is also known as finger lime, Australian finger lime, and citrus caviar.

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• All 3899 plant care guides in the Growli library