Here’s a clear, grower-focused report on finger limes, covering what they are, why they’re special, and how to grow them successfully.

1. What Are Finger Limes?
Finger limes (Citrus australasica) are a unique citrus fruit native to the subtropical rainforests of eastern Australia. They are often called “citrus caviar” because their pulp consists of tiny, juice-filled vesicles that resemble caviar.
Key Characteristics
Fruit shape: Long and narrow (finger-shaped), 2–5 inches long
Pulp colors: Green, yellow, pink, red, purple, or clear
Flavor: Tart, citrusy, with hints of lime, lemon, and grapefruit
Tree size: Small to medium shrub or tree (6–15 ft tall)
Thorns: Very thorny branches
Leaves: Small, narrow, and aromatic
Culinary Uses
Garnish for seafood, oysters, sushi, cocktails, and desserts
Used fresh (not usually juiced)
Popular in high-end restaurants and specialty markets

2. Climate and Growing Requirements
Climate
Best zones: USDA Zones 9–11
Temperature tolerance:
Ideal: 65–85°F (18–29°C)
Cold sensitive; damage below 32°F (0°C)
Can be grown in containers in cooler climates and moved indoors during winter
Sunlight
Full sun to partial shade
6–8 hours of sunlight daily
In very hot climates, afternoon shade is beneficial

3. Soil Requirements
Well-draining soil is critical
Slightly acidic pH: 5.5–6.5
Ideal soil mix:
Sandy loam or citrus potting mix
Organic matter (compost)
Perlite or coarse sand for drainage
Avoid waterlogged soil—root rot is a major cause of failure.

4. Planting Finger Limes
In the Ground
Choose a sheltered spot protected from strong winds
Dig a hole twice as wide as the root ball
Plant at the same depth as the nursery container
Backfill with native soil mixed with compost
Water deeply after planting
In Containers
Use a 15–25 gallon pot with drainage holes
Citrus-specific potting mix
Elevate pot slightly to improve drainage

5. Watering Needs
Water regularly during establishment (first 6–12 months)
Once established:
Deep watering every 7–10 days
Allow topsoil to dry slightly between waterings
Reduce watering in cooler months
Overwatering is more harmful than underwatering.

6. Fertilization
Use a citrus fertilizer with micronutrients (iron, zinc, magnesium)
Fertilize:
Early spring
Early summer
Late summer
Avoid heavy fertilizing in fall and winter
Organic options:
Compost
Worm castings
Fish emulsion (diluted)

7. Pruning and Maintenance
Minimal pruning required
Remove:
Dead or damaged branches
Crossing branches
Prune after fruiting
Wear gloves—thorns are sharp
Mulch around the base (but keep mulch away from the trunk) to retain moisture and suppress weeds.

8. Flowering and Fruiting
Trees typically flower in spring
Fruits mature in late summer to winter
Time to fruit:
Grafted trees: 2–3 years
Seed-grown trees: 6–10 years
Fruit is ripe when:
Slightly soft
Full color develops
Vesicles pop easily when squeezed

9. Common Problems
Pests
Citrus leaf miner
Scale insects
Aphids
Spider mites
Control with:
Neem oil
Insecticidal soap
Beneficial insects
Diseases
Root rot (from poor drainage)
Citrus canker (rare in home gardens)
Fungal leaf spots in high humidity
Good airflow and proper watering prevent most issues.

10. Why Grow Finger Limes?
High market value
Unique appearance and flavor
Compact growth habit
Excellent container citrus
Long productive lifespan (30+ years)

11. Summary
Finger limes are a premium citrus crop prized for their distinctive texture and flavor. While slower growing than common citrus, they reward patience with high-value fruit and ornamental appeal. With good drainage, warm temperatures, and careful watering, finger limes can thrive in home gardens and containers alike.