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Citrus Plants, Australian Finger Lime
(Citrus australasica) Order includes 1 plant. The 3-inch, elongated fruit of this thorny citrus relative is packed with tiny capsules of intense lime flavor! The compact shrub is native to coastal Queensland and New South Wales, Australia, finger lime was long a wild-foraged food for indigenous people – and later colonial settlers – and an important source of vitamin C. Finger lime cultivation began in the 1990s, and demand for this unique fruit grew quickly. We certainly see why!
- Perennial in USDA zones 9-11 (can be grown in containers and overwintered indoors in colder zones)
- Days to harvest: 180-270 days (6-9 months after flowering)
- Sun exposure: 6-8 hours of full to partial sun
- Planting depth: Same depth as the root ball
- Plant spacing: 6 to 10 feet (for mature canopy spread)
- Ideal temperature: 60°F to 85°F
- Frost Hardy? Moderately – tolerates brief exposure to 32°F but should be protected from prolonged frost.
Growing Tips
Australian Finger limes thrive in well-draining, slightly acidic soil (pH 6.0-7.0). Ensure the tree receives 6-8 hours of sunlight daily. Water consistently but avoid waterlogged conditions. Apply a citrus-specific fertilizer during the growing season. Prune lightly after fruiting to shape the shrub, improve airflow, and remove dead or crossing branches.
When to Grow
Plant Australian Finger limes in spring after the last frost to allow roots to establish before winter. In warm climates (zones 9-11), fall planting is also suitable. For areas outside their perennial zones, grow them in containers that can be moved indoors during colder months. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'
How to Sow and Plant
Choose a sunny, sheltered site with well-draining soil. Dig a hole twice the width of the root ball and as deep. Place the plant in the hole, ensuring the root crown is level with or slightly above the soil surface. Water deeply after planting and apply a 2-inch mulch layer around the base, avoiding direct contact with the trunk.
How to Grow
Water regularly, allowing the top inch of soil to dry between waterings. Feed with a balanced citrus fertilizer every 6-8 weeks during the growing season. Protect from frost with coverings or by bringing potted shrubs indoors. Prune minimally to maintain shape and encourage fruiting while ensuring the plant remains well-ventilated.
How to Save
FAQ
How long does it take for an Australian Finger lime tree to produce fruit?
Grafted Finger lime trees typically produce fruit within 2-3 years. Seed-grown trees may take 5-6 years or longer. The shrub flowers in spring, and the fruit matures over several months, becoming harvest-ready in late summer to early fall.
Can I grow Australian Finger limes in a pot?
Yes, Australian Finger limes adapt well to container growing. Use a large pot with good drainage and a citrus-specific soil mix. Ensure the plant gets at least 6 hours of sunlight daily, and bring the container indoors or to a protected area during cold weather.
How do I protect my Australian Finger lime from frost?
In regions prone to frost, protect your Finger lime shrub by covering it with frost cloth or burlap during cold snaps. For potted plants, bring them indoors or into a greenhouse when temperatures drop below 40°F. Mulch around the base to insulate the roots during winter.
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