How to Grow Finger Lime 'Judy's Red'

Finger Lime 'Judy's Red'

Citrus australasica 'Judy's Red'

tree

Finger Lime 'Judy's Red' is a compact Australian citrus tree producing small, elongated fruits with deep red flesh and a unique caviar-like texture when the juice sacs burst. The tree is smaller and more ornamental than standard citrus, making it ideal for containers and small spaces. Known for its distinctive ruby-red colored juice vesicles with a tangy, complex citrus flavor.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; afternoon shade beneficial in very hot climates (above 95°F)

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Water: Regular watering to keep soil consistently moist but not waterlogged. Water deeply once or twice weekly depending on rainfall and temperature. In containers, check soil moisture frequently. Reduce watering slightly in winter but don't allow complete drying.

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Spacing: 120 inches

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Days to maturity: 1095-1825 (trees typically produce fruit in 2-3 years from a grafted specimen)

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Planting depth: Plant at same depth as root ball; graft union should be 6 inches above soil line for field growing

Soil

Type: Well-draining, slightly acidic loamy soil with good organic matter

pH: 6.0-7.0

Amendments:

Compost or aged manure Perlite or coarse sand for drainage Mulch (3-4 inches) to retain moisture and regulate temperature

Growing Zones

Find your zone →

Thrives in zones 9b-11; can be grown in zones 8b-9a with winter protection

9b 10a 10b 11a 11b

Growth Stages

Young Tree Establishment

2-3 months

Recently planted sapling with developing root system and initial branch structure. Tree is 12-24 inches tall with minimal lateral growth.

Water regularly to establish roots; use stake or support system; avoid fertilizer for first 2-3 months; prune only damaged branches; protect from strong winds.

Vegetative Growth

6-12 months

Active shoot development with glossy, dark green leaves appearing in flushes. Tree reaches 3-6 feet height over first year; dense, compact branching begins.

Apply balanced citrus fertilizer monthly during growing season (spring-early fall); maintain consistent moisture; light formative pruning to shape canopy; monitor for pests; mulch to suppress weeds.

Pre-Flowering

Several months before flowering

Tree has developed mature branch structure (2-3 years old). Branches thicken and leaf canopy becomes dense; tree reaches 4-6 feet in containers or 8-10 feet in ground.

Continue regular fertilizing; reduce nitrogen slightly to encourage flowering; ensure adequate potassium and phosphorus; prune only to remove crossing or damaged branches; maintain airflow in canopy.

Flowering & Fruit Set

4-8 weeks for flowering; fruit development continues 4-5 months

Small, fragrant white or pale pink flowers appear in leaf axils, typically in spring. Flowers develop into tiny, immature finger-shaped fruits with prominent ridges; ruby-red color begins developing.

Avoid major pruning during flowering; reduce watering slightly to concentrate sugars; do not fertilize during active flowering; ensure good pollinator access; hand-thin fruit if overcrowding to 4-6 inches apart.

Fruit Maturity & Harvest

4-5 months from fruit set to harvest; typically late fall to winter

Finger lime fruits mature to 2-4 inches long with distinctive deep red or crimson flesh. Fruits develop rich aroma and firm texture; skin color shifts from green to yellow-green when ripe.

Maintain consistent watering during fruit maturation; fruit is ready when firm and aromatic; harvest gently to avoid bruising; store at room temperature 1-2 weeks or refrigerate up to 3 weeks; some fruit may persist on tree.

Companion Planting

Plan your garden →

Plant with:

Citrus trees (other varieties for cross-pollination) Borage Marigold Nasturtium Fennel Basil

Avoid planting near:

Black walnut (toxin allelopathy) Fennel (in some configurations) Other plants competing for nutrients in small containers

Common Pests

Regular inspection; insecticidal soap or neem oil for light infestations; yellow sticky traps; remove infested leaves; avoid overhead watering that promotes pest habitat
Increase humidity; mist foliage; spray with water to dislodge; neem oil or miticide for severe cases; ensure adequate irrigation
Remove by hand or with alcohol-soaked cotton swab; insecticidal soap; neem oil; encourage natural predators like ladybugs
Horticultural oil spray during dormancy; rubbing alcohol on individual scales; persistent treatment over multiple seasons may be needed
Yellow sticky traps; strong water spray; insecticidal soap; neem oil; improve air circulation

Uses

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Gourmet Garnish & Molecular Gastronomy

Culinary

The unique caviar-like juice vesicles burst on the palate, making Finger Lime 'Judy's Red' prized for high-end plating, cocktails, and desserts. The deep red color and complex citrus flavor add visual drama and taste complexity to dishes. [source]

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Fresh Juice & Beverages

Culinary

Squeeze the ruby-red juice over seafood, salads, and Asian cuisine, or use as a signature ingredient in cocktails and fresh juices. The unique flavor profile offers complex tartness with floral undertones. [source]

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Desserts & Preserves

Culinary

The vibrant color and tart-sweet flavor make it excellent for marmalades, sauces, and as garnish for tarts, cheesecakes, and ice cream. The juice can be used to make unique jellies and syrups. [source]

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Vitamin C & Antioxidant Source

Medicinal

Like other citrus fruits, Finger Lime contains significant vitamin C and antioxidants that support immune function and cellular health. The unique pigments in the red flesh suggest additional phytonutrient benefits. [source]

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Container & Ornamental Gardening

Household

The compact size and attractive white flowers make 'Judy's Red' an excellent choice for patios, balconies, and small gardens. Dramatic red fruit adds year-round visual interest and is highly ornamental. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Finger limes 'Judy's Red' typically ripen in late fall to winter (November-January in Northern Hemisphere). Fruit is ready when fully firm, aromatic, and skin has shifted from green to yellow-green. Gently twist or cut fruit with pruning shears to avoid damaging branches. Harvest regularly to encourage continued production. Fruits can hang on tree for several weeks after ripeness without significant quality loss. For best flavor, use within 1-2 weeks of harvest, though refrigeration extends storage to 3+ weeks.

Fun Facts

🌱 Finger Lime 'Judy's Red' is native to Australian rainforests and was relatively unknown outside Australia until the early 2000s, making it a modern discovery for global horticulture.
🌱 The distinctive juice sacs burst on the tongue like caviar, which is why finger limes are sometimes called 'citrus caviar'—a feature that commands premium prices in upscale restaurants and markets.
🌱 Unlike conventional citrus trees, Finger Limes are highly compact and can produce full-sized harvests in containers as small as 15-20 gallon pots, making them ideal for apartment dwellers and those in cold climates who can bring them indoors seasonally.

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