Finger Lime Tree: The Caviar Of Citrus


Finger limes are slowly being launched into the culinary world, however rapidly turning into cooks’ favorites. Finger limes are described as citrus caviar as a result of the feel of the pulp resembles caviar. The pulp incorporates small spherical vesicles crammed with juice that present a burst of refreshing acidity and taste with each chunk. Growing a finger lime tree is extremely straightforward and the fruit could be saved within the freezer to be loved any time of the 12 months. 

The juicy pearls of finger lime fruit can be utilized as a garnish on an infinite quantity of dishes and desserts. They pair notably effectively with seafood however could be added to cocktails and desserts. It is a wonderful substitute for lime juice and in some circumstances a greater possibility. Using finger limes in tacos and fruit salad provides the scrumptious lime taste with out making your tortilla soggy or the fruit salad watery. If you’re a fan of tangy taste, you possibly can even eat these on their very own. 

Finger lime timber could be integrated into nearly any area. They are low upkeep and thrive within the warmth, however will want safety from frost. Luckily, they develop effectively in containers so bringing them indoors through the winter is a good possibility for cooler climates. Finding a finger lime tree could also be your greatest problem. They are seldom present in shops, however there are a handful of on-line retailers that may ship on to your house.

Good Products At Amazon For Growing Finger Limes:

Quick Care Guide

The finger lime tree produces small fruit filled with juice-filled vesicles. Source: mmmavocado
Common Name(s) Australian Finger Lime, Finger Lime, Caviar Lime
Scientific Name Microcitrus australasica or Citrus australasica
Days to Harvest Harvest yearly March-May
Light Partial to full solar
Water Moderate
Soil Well-draining
Fertilizer Every 6 weeks from spring-summer
Pests Mites, scales, lepidopterans, aphids, ACP
Diseases Phytophthora, twig dieback, HLB

All About The Finger Lime Tree

Finger lime
Most finger limes will not be very giant, however they’re filled with taste. Source: RBerteig

Microcitrus australasica is often known as finger lime, Australian finger lime, and caviar lime. Despite trying fairly completely different, Australian finger limes are associated to widespread citrus varieties reminiscent of lemons, navel oranges, and mandarins. Microcitrus australasica is one in all six native citrus species to Australia the place it grows within the rainforest as an understory shrub or small tree. Shrub and tree dimension varies between 6-25 ft. The Australian finger lime tree has small, reverse, evergreen leaves with a thorn at every leaf axil. The flowers are vivid pink fading to pale pink or white. Fruit is lengthy, cylindrical, and sometimes curved; some say resembling fingers. Fruit is often seedless or incorporates only a few small seeds.

Depending on the range, fruit dimension ranges from 1.5-5.5 inches and colours embody purple, yellow, inexperienced, purple, and brown. In Australia there are a number of established varieties obtainable nonetheless there could also be fewer choices obtainable in different nations. Some examples of well-liked varieties embody ‘Red Champagne’, ‘Chartreuse’, ‘Crystal’, and ‘Pink Ice’. Each selection has a unique sugar-acid ratio giving them every a singular taste. They even have completely different coloured pearls or vesicles. 

Australian finger lime timber are usually planted as grafted timber and can begin producing 1-2 years after planting. It takes 4-5 years for the tree to provide an abundance of fruit. Trees flower within the fall and are prepared for harvest between March and May. Some varieties might produce a month earlier or later. Finger lime timber are self-fertile however will yield a heavier crop when pollinated.

Microcitrus australasica just isn’t solely particular for its distinctive fruit. It would be the key to discovering a remedy or resolution to Huanglongbing (HLB) or citrus greening. HLB is a illness that causes small and deformed fruit and the eventual demise of citrus timber. It has been devastating to citrus producers all over the world, particularly within the United States, China, and Brazil. Australian finger lime has proven each tolerance and resistance to HLB. Tolerance implies that the timber grow to be contaminated, however the signs are gentle and the tree can develop and proceed producing marketable fruit. Resistance is when the tree just isn’t inclined to the HLB and doesn’t grow to be contaminated after publicity. Understanding and using these traits are essential to defending citrus manufacturing all over the world. 


The finest time to plant a younger tree is within the spring after the final frost. It may also be planted by way of the summer time, however keep away from temperatures that exceed 90°F for a few weeks whereas the tree acclimates. Choose a sunny, heat location with good soil drainage. Keep in thoughts, this tree has quite a lot of thorns, so keep away from planting in excessive site visitors areas the place individuals or pets might by chance are available in contact. Shelter from wind can also be vital. Excessive wind could cause the thorns to wreck or puncture the fruit. 

This tree could be planted in a big container or within the floor. If planting in a pot, use at the very least a 10-gallon pot and a potting combine particularly formulated for citrus. Water within the newly planted tree till your entire pot is saturated. When planting within the floor, dig a gap twice as huge and simply as deep as the foundation ball. Fill within the gap, cowl with mulch, and water in. Whether planting in a container or the bottom, don’t bury the graft union. The rootstock must be at the very least just a few inches above the soil stage.


Finger lime flower
Citrus australasia flowers are small however fairly. Source: Rod Waddington

Caviar limes require little or no effort to develop. Providing one of the best care on your tree will hold it trying lovely and productive. 

Sun and Temperature

Australian finger lime requires a fan of full solar which means at the very least 6 hours of direct mild per day. They are hardy to zones 8-11 however could be grown in colder areas if introduced inside throughout frost.

Finger limes thrive in temperatures above 90°F through the summer time and gentle winters above 40°F. Trees require safety through the winter if temperatures drop beneath freezing.

Water and Humidity

Water within the morning a few times per week. Soil must be saved moist, however not soggy or saturated. Soaker hoses or drip irrigation must be used for irrigating to keep away from water runoff.

Finger limes planted in containers might have to be watered extra usually. They must be absolutely saturated and allowed to dry down till barely moist earlier than the following watering. Potted timber could be watered utilizing drip irrigation or manually with a hose.

Do not permit the soil to dry and hold vegetation well-watered throughout flowering and fruit growth. Underwatering through the hotter months can result in leaf drop. Trees don’t want additional water throughout wet seasons. 


Australian finger lime can develop in a variety of soil varieties so long as it’s well-draining. They favor loamy soils with excessive natural matter. For optimum progress, the soil pH must be barely acidic to impartial.


There are quite a lot of completely different fertilizers obtainable particularly formulated for citrus. The charges and utility frequency rely upon the fertilizer mix and whether or not or not it’s a slow-release mix. Slow-release blends usually have to be utilized a few times a 12 months.

Fertilize finger limes within the spring and summer time. Keep in thoughts, Australian finger lime doesn’t require as a lot fertilizer as different citrus varieties reminiscent of a lemon or mandarin tree. Do not over-fertilize throughout bloom and fruit growth as a result of it could trigger the flowers and fruit to drop. If a citrus fertilizer combine just isn’t obtainable, 12-6-6 can be utilized. Look for fertilizer blends that additionally incorporate micronutrients reminiscent of magnesium, zinc, iron, and copper.


Finger lime thorns
Be cautious and use protecting gear as finger lime timber have very sharp thorns. Source: Starr

Pruning could be completed at any time through the 12 months, but it surely’s finest completed after harvesting to keep away from eradicating flowers and fruit. Typically fruit is able to harvest March-May and flowering begins within the fall. Australian finger lime is tough to prune as a result of it is filled with thorns. Use hand and eye safety when pruning. Heavy-duty, puncture-resistant work gloves are extremely beneficial.

Pruning must be completed to keep up dimension, take away troublesome branches, and take away lifeless shoots. Finger limes don’t require previous progress to provide fruits. Most fruit will naturally fall off the tree. Manually take away any previous fruits that don’t fall off naturally. Australian finger timber will not be deciduous, so leaves will stay on the tree your entire 12 months.


Grafting and rooted cuttings are one of the best strategies for propagating Australian finger lime. Seeds could be tough to search out and profitable germination is uncommon.

Chip budding is probably the most generally used approach for grafting Australian finger lime and is often grafted onto a rootstock seedling. If planting within the floor, grafted timber are the best choice. Seedlings usually have higher root construction than rooted cuttings making the tree extra steady. Depending on the kind of rootstock, they will present illness resistance, larger chilly tolerance, and peak management.

Rooted cuttings are a quite simple technique to propagate Australian finger lime. Cuttings must be between 2-4 inches and a rooting hormone must be used to hurry up root formation. Keep the cuttings in a moist setting away from direct mild till roots have been established. Cuttings will take round two weeks to start out creating roots. Slowly acclimate over 1-2 weeks earlier than exposing to direct daylight. Trees propagated by cuttings are most fitted for containers and shouldn’t be planted within the floor.

Harvesting and Storing

Caviar limes
The “caviar lime” can develop in shades of purple, brown, pink, inexperienced, or purple. Source: Tatters

Harvesting finger lime fruit just isn’t a enjoyable process with out correct safety. These thorny vegetation could make harvesting a nightmare when you aren’t cautious. Once the fruit is picked, there are just a few choices for storing to ensure your laborious work doesn’t go to waste!


Color is the primary indicator for figuring out if finger limes are prepared to reap. Depending on the range, finger lime fruit could be purple, yellow, inexperienced, purple, or brown.  Once they’re exhibiting full shade, gently pull the fruits. Ripe fruit will simply come off the tree. If the fruits have to be pressured, then it’s not absolutely ripe and able to harvest. When harvesting fruits, it’s clever to put on thick, impenetrable gloves to keep away from being pricked by thorns.


Fruits could be saved at room temperature for a few week and within the fridge for about 3 weeks. Keep refrigerated fruits in a breathable bag or container.

Surprisingly, caviar limes retailer effectively within the freezer. To freeze, place entire fruits in a sealed freezer-safe container. The pulp maintains its “caviar” texture and could be saved for six months.


Australian finger lime foliage
Finger lime leaves are fairly and have a rounded to barely pointed form. Source: Starr

Australian finger limes sometimes have minor rising points. Most points could be prevented or simply resolved. Below are some suggestions for having a problem-free rising expertise. 

Growing Problems

Despite being shade tolerant, finger lime timber might produce little or no fruits if given an excessive amount of shade. The plant will proceed to outlive and develop, however fruit manufacturing might be compromised.

Flower abortion and untimely fruit drop are generally brought on by excessive climate and over-fertilizing throughout flowering or when the fruit is first beginning to develop. Do not fertilize throughout flowering or the first phases of fruit growth to forestall undesirable fruit loss. Some flower and fruit drop is regular and to be anticipated.

Damaged fruit is a typical challenge, particularly in windy areas. The thorns create open wounds within the fruit resulting in mould and rotten fruit. Avoid planting in windy areas or present a wind barrier when the fruit is creating. 


There are just a few species of mites which are problematic to caviar limes. Mites are extraordinarily small arachnids which are tough to note with the bare eye. They trigger stippling harm to the leaves and heavy infestations will trigger leaf drop. Usually, the harm is seen earlier than the pest. All grownup mites are small, eight-legged, and have a tendency to remain in clusters on the undersides of leaves. Some mites produce webbing whereas others don’t. Colors vary from creamy yellow to darkish purple. Mites are likely to assault weak or careworn timber. Maintaining a wholesome tree is a very powerful protection in opposition to mites as a result of they have a tendency to have a very good steadiness between pest mites and predatory bugs to maintain the populations beneath management. If mite populations get uncontrolled horticultural oils and insecticidal soaps can be utilized to knock down heavy infestations.

Soft and armored scales could be discovered on the twigs and branches of timber. There are a number of species of scale in quite a lot of colours starting from yellow to brown to black. Damage doesn’t come immediately from the size. Scales produce extreme quantities of honeydew which ends up in sooty mould. Sooty mould covers the leaves which inhibits photosynthesis and results in leaf drop. Scales are normally managed by pure predators and parasites. If therapy is important, oil sprays are efficient.

Aphids are a small soft-bodied insect that feeds on the sap of tender plant tissue. They are available in quite a lot of colours reminiscent of yellow, orange, inexperienced, and black. Similar to scale bugs, they produce honeydew which may result in different issues like sooty mould. Aphids are normally managed by pure predators; nonetheless, populations can nonetheless grow to be off-balanced and damaging. Aphids could be managed by manually eradicating leaves with heavy infestations and by hosing them off with water. Horticultural oils and insecticidal soaps are additionally efficient in controlling aphids.

Lepidopteran pests embody a number of kinds of moth larvae that trigger harm to the leaves. There are just a few leaf curler species that trigger harm to the tender new progress. Citrus leaf miner can also be a lepidopteran pest that causes mining harm usually on the undersides of leaves. Mining harm appears to be like like tunnels beneath a shallow layer of the leaves. Lepidopteran pest harm is generally beauty however can stunt progress in younger timber. Larvae could be manually eliminated on younger timber. Treatment shouldn’t be obligatory on mature timber. If citrus leaf miner harm is bothersome, pheromone traps could be positioned on timber to disrupt mating.

Asian citrus psyllid (ACP) is a small mottled brown insect about the identical dimension as an aphid. Nymphs are yellow to inexperienced and lay flat on leaves and twigs. These psyllids produce white spindly excrement, which makes identification simpler. Psyllids inject a toxin throughout feeding which can trigger burn again on tender rising suggestions. However, feeding harm just isn’t the principle concern. They are thought-about a significant pest as a result of it vectors HLB. Research has proven that ACP just isn’t almost as drawn to Australian finger lime as different kinds of citrus. However, it’s vital to watch your tree and pay attention to the pest to assist stop the unfold of HLB. Depending in your space, the presence of ACP will warrant completely different responses. It’s finest to analysis the native rules and attain out to your county workplace if there are any questions.


Phytophthora is without doubt one of the commonest root ailments in citrus. It causes a basic decline in timber. The leaves will look yellow or a light-weight inexperienced shade. Advanced phases will current “gumming” or sap oozing from the trunk of the tree. Trunks may exhibit a water-soaked look.  Phytophthora is prevented by utilizing finest irrigation practices and planting in well-draining soil. Some rootstocks are resistant or extra tolerant of phytophthora. It is extraordinarily vital to depart at the very least just a few inches of the rootstock above the soil line. There are useful microbes and mycorrhizae merchandise that may be utilized to spice up plant well being and immunity to ailments like Phytophthora. However, good watering practices might be sufficient for the prevention.

Twig dieback could be brought on by just a few completely different fungal pathogens. Twig dieback normally happens through the wet season. Chemical therapy just isn’t obligatory. Simply prune off broken twigs and branches to forestall the an infection from spreading.

Huanglongbing (HLB) can also be known as citrus greening illness. Symptoms of an infection embody yellow mottled leaves, sudden demise in younger timber, and small or deformed fruit. HLB is unfold by the ACP, so controlling the insect will stop the illness. It may also be transferred when grafting with contaminated plant materials. There isn’t any remedy for HLB so as soon as a tree is contaminated, it must be eliminated. Australian finger lime has proven some tolerance to HLB, so signs could also be gentle. If you believe you studied your tree is contaminated, it’s finest to have it examined and eliminated if contaminated. Removing contaminated timber will stop the unfold to different citrus timber within the surrounding space. It is vital to make sure that any new timber planted come from dependable nursery sources following every state’s rules. For instance, citrus timber grown in California ought to have a CDFA label that ensures they’ve come from clear nursery inventory.

Frequently Asked Questions

Q: How lengthy does it take for finger lime to fruit?

A: Finger lime will begin to fruit after one 12 months. They will produce an ample quantity of fruit after 4-5 years.

Q: Can you develop finger limes within the US?

A: Absolutely! Although it could be tough to search out in shops, there are just a few on-line retailers that may ship a tree on to your house.

Q: How massive do finger lime timber get?

A: Australian finger lime timber vary in dimension from 6-25 ft relying on the range and rootstock. Trees could be pruned to keep up the specified peak.

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