Lexi Webster
Finger limes, also known as Australian native caviar, are a sought-after delicacy in many kitchens. These fruits, which resemble caviar, offer a burst of flavour in dishes and can be grown at home or purchased from growers. They are found growing naturally in most tropical and subtropical regions across Queensland and New South Wales, particularly along the east coast of Australia and the border of these two states.
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What You'll Learn
Queensland and New South Wales
Finger limes are native to the rainforests of southeast Queensland and northeast New South Wales. They are found growing naturally in most tropical and subtropical regions across these two states, particularly along the east coast of Australia. They thrive in well-drained soil with a pH of between 6 and 7 and are typically propagated using budwood or grafted onto exotic citrus, with Citrus trifoliata being the most common.
In terms of climate, finger limes prefer warmer regions and can be planted in autumn to avoid frost. They require small amounts of fertiliser every 2-3 months and benefit from soil conditioners like seaweed emulsion or worm castings applied regularly. The flowers of the finger lime tree are white or pale pink and appear in late summer to autumn, followed by elongated fruits that ripen in winter through to spring.
When growing finger limes, it is important to manage weeds as they compete with the trees for nutrients and can attract insects that damage the crop. Additionally, finger limes suffer from similar pests and diseases as other citrus plants, such as various types of bugs, caterpillars, grasshoppers, and fungal diseases.
In Queensland, there are fruit fly exclusion zones in place, which can impact the cultivation and export of finger limes. Despite these challenges, finger limes are a popular choice for professional chefs and home cooks in Queensland and New South Wales due to their unique citrus flavour and versatility in culinary applications.
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Soil and climatic conditions
The climatic conditions required for growing finger limes vary depending on the cultivar and the region in which it is being grown. In general, finger limes are native to tropical and subtropical regions of Queensland and New South Wales in Australia, where they grow naturally along the east coast. They can withstand light frost levels but are sensitive to undesirable climatic conditions, with their flowering and fruiting abilities significantly decreasing in areas south of Sydney.
When it comes to soil conditions, finger limes are quite adaptable. They can be grown on a wide range of soils, from heavy soils in high rainfall areas to well-drained soils with a pH of 5-6.5. To maximise drainage in heavy soils, finger limes can be planted on mounded rows. In temperate areas, deep loamy soils with adequate irrigation are ideal. The soil should be nutrient-rich, with high levels of organic matter and a slightly acidic pH.
To ensure the successful growth of finger limes, it is important to consider the water and fertiliser requirements. Finger limes need as much water as other citrus fruits, especially when producing a large crop, but they require less fertiliser due to their smaller fruit size. A dose of organic fertiliser or citrus food in late winter and late spring is usually sufficient. Light fertiliser application in spring can also support fruit production.
The position and pruning of the trees are also important considerations. Finger lime trees prefer part-shade to full sun positions and should be lightly pruned in spring, avoiding harsh pruning when fruit is forming to prevent accidentally cutting off the upcoming crop. Additionally, mulching around the trunk should be avoided as it can cause collar rot.
Overall, finger limes are adaptable to a range of climatic and soil conditions, making them suitable for cultivation in various parts of Australia. However, it is important to consider the specific requirements of each cultivar and region to ensure optimal growth and fruit production.
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Pests and diseases
Australian finger limes are susceptible to a variety of pests and diseases, which can affect their growth and overall health. These pests and diseases can cause issues such as branch dieback and defoliation, leading to an unhealthy and unattractive tree.
Firstly, finger limes are vulnerable to sap-sucking insects, including aphids, mites, and scale. These pests draw energy from the tree, transmitting bacterial and viral diseases that may even kill the plant. One of the signs of sap-sucking insects is sooty mould, a black coating on the foliage and fruit caused by the feeding of sap-suckers. To control sap-sucking insects, you can spray the tree with OCP eco-oil.
Secondly, finger limes are susceptible to fungal diseases such as melanose, gummosis, phytophthera, and dry fusarium rot. To manage fungal diseases, you can prune off dead twigs and branches and remove any diseased material from under the tree.
Additionally, finger limes may suffer from pests such as the crusader bug, spined citrus bug, bronze orange citrus bug, grasshoppers, psyllids, leaf miner, leaf hoppers, nematodes, and mealy bugs. One method to control these pests is to encourage predatory bugs into your garden or purchase and release them.
Furthermore, the citrus gall wasp (Bruchophagus fellis) is an Australian native insect pest that specifically targets finger limes. The wasp reduces fruit size, tree vigour, and yield. To limit the damage caused by the wasp, it is recommended to check your citrus trees between June and September when galls are most visible and prune and burn the infected branches before adult wasps emerge.
Lastly, while less common, fruit flies may also attack finger limes. If you notice sting marks and maggots inside the limes, you should use protective measures such as hanging OCP eco-lure traps and using bait sprays or exclusion netting to safeguard the fruit.
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Propagation methods
Finger limes, a native Australian fruit, can be propagated using various methods, each with its own advantages and drawbacks. Here is a detailed guide to the different propagation methods for finger limes in Australia:
- Seed Propagation: Finger limes can be grown from seeds, but this method is slow, and the resulting trees may take up to 15 years to bear fruit. Additionally, trees grown from seeds may not be identical to the parent plant and can exhibit variations.
- Semi-Hardwood Cuttings: This method involves using semi-hardwood cuttings from existing finger lime trees. While it is possible to propagate finger limes this way, it is slow and the success rate is low. The use of growth hormones can stimulate root development and improve the chances of success.
- Grafting: Grafting is a preferred method for propagating finger limes. It involves grafting the desired variety of finger lime onto a suitable rootstock, such as Citrus trifoliata. Grafting offers several advantages, including faster growth, improved fruit production, and enhanced resistance to certain pests and diseases. Grafted trees can also better withstand varying climatic conditions.
- Budwood Propagation: Commercial growers often use budwood propagation, which involves grafting buds from one tree onto another. This method ensures that the new tree retains the characteristics of the parent plant and speeds up the fruit production process.
- Hedgerow Planting System: Many commercial growers use this system, which involves planting finger lime trees in rows or hedges. This method maximises space and facilitates easy maintenance and harvesting. It is particularly suitable for heavy soils or high rainfall areas, as it promotes better drainage.
- Soil and Sunlight Considerations: Finger limes are adaptable and can be grown in a wide range of soils, from deep loamy soil in temperate regions to various tropical and subtropical soils. They thrive in dappled sunlight to full sun and can be grown in gardens, containers, or as hedges. In cooler regions, a north-facing location in a semi-shaded area is ideal.
- Fertilisation and Pest Management: Light fertiliser application in spring can support fruit production. Regular fertilisation with worm castings or seaweed emulsion is recommended. Finger limes are susceptible to pests and diseases common to citrus plants, such as aphids, caterpillars, grasshoppers, and fungal infections like melanose. Proper pest management practices, including pruning and encouraging predatory insects, are essential.
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Harvesting and fruit production
Finger limes are native to the rainforests of southeast Queensland and northeast New South Wales, but they can be grown in other regions as well. They grow in a wide range of soils in tropical and subtropical rainforests and are most commonly grafted onto exotic citrus rootstock, with Citrus trifoliata being the most common. Grafted finger limes grow faster and can withstand other climatic conditions because the grafted wood is usually taken from a mature tree.
Commercial finger lime trees are typically propagated using budwood rather than growing from seed, as the latter is slower to produce fruit, has a reduced growth rate, and may not be a replica of the parent species. Finger limes are often planted in spring to avoid frost but can be planted in autumn in warmer regions. Many commercial growers use a hedgerow planting system, although trees planted in heavy soils or high rainfall areas can be planted on mounded rows to maximise drainage.
Fruit production can be supported with light fertiliser application in spring, and small amounts of fertiliser every 2-3 months. Soil conditioners like seaweed emulsion or worm castings can also be applied regularly, for example, every 2 weeks. The trees typically flower from June to October and the fruit is harvested between December and May. Harvesting is predominantly conducted by hand because the fruit is easily damaged and the trees do not lend themselves to mechanical harvesting. Climatic conditions alter the maturing rate of the fruit, so harvesting occurs every 10-14 days over a 6-8 week period. Fruit is picked when it changes colour, signalling that it is ripe, as it does not ripen off the tree.
There are several challenges to fruit production. Firstly, weather conditions can have a major impact. For example, unusually wet conditions can cause fruit to split, resulting in high losses. Wind rub and sunburn can also damage production. Ensuring proper pollination is also important, as fruit deformation can occur without complete pollination. Furthermore, managing weeds is crucial as they compete with the trees for nutrients, can be a vector for viruses, and attract insects that can damage the plantings and crops.
Pests and diseases are another concern for finger lime production. Some common pests include the spined citrus bug, bronze orange bug, aphids, mealybugs, caterpillars, snails, katydids, and grasshoppers. These pests can be treated with a variety of methods, including pesticides, destruction of infested fruit and foliage, or physical removal if isolated. Diseases that affect finger limes include dieback, Melanose, Stylar End Breakdown, and Oleocellosis. Strategies to manage these diseases include selecting resistant varieties, appropriate care at harvest time, and treatments such as copper fungicide.
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Frequently asked questions
Finger limes are found growing naturally in tropical and subtropical regions across Queensland and New South Wales. They can also be found growing wild around the border of these two states.
Finger lime trees can grow up to 5 metres tall and 2 to 3 metres wide in cultivation.
Finger lime trees can grow in part-shade to full sun.
Finger limes prefer well-drained soil with a pH of 5-6.5. They can be grown on a wide range of soils, but in temperate areas, deep loamy soils with adequate irrigation are ideal.
Finger limes flower from late winter to spring, and the fruit ripens between May and June.
