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Calamansi
The Philippine souring citrus - a compact, cold-hardy, almost thornless shrub that flowers and fruits nearly year-round, carrying blossom, green fruit and ripe fruit at once. Grown for its tart, aromatic juice, not for eating whole. One of the best container and indoor citrus there is.
Seeds are bitter - strain them. Calamansi juice on skin followed by sunlight can cause phytophotodermatitis, a delayed blistering burn, so rinse hands after juicing and do not use it as a folk skin treatment before going outside. The juice is also very acidic and hard on tooth enamel undiluted. No grapefruit-type drug interaction is known, but calamansi is far less studied than grapefruit; if a medicine you take carries a grapefruit warning, ask your pharmacist.
Overview
The one thing to knowCalamansi is the sour note in Filipino cooking - the juice squeezed over pancit, stirred into a soy-and-vinegar sawsawan dipping sauce, mixed with sugar and cold water into the drink half the country grew up on.
Calamansi is the sour note in Filipino cooking - the juice squeezed over pancit, stirred into a soy-and-vinegar sawsawan dipping sauce, mixed with sugar and cold water into the drink half the country grew up on. The fruit itself is small, round, thin-skinned, and about the size of a large marble, ripening from deep green through yellow to orange. What you want from it is the juice: sharply tart like a lime but rounder and more perfumed, with a mandarin-ish aroma that no lime has. It is often sold in the US as a houseplant under its other name, calamondin, and a great many people own one without ever realising the fruit is a serious cooking ingredient rather than a decoration.
As a plant it is unusually obliging. It is compact and shrubby, nearly thornless, tolerant of pruning, and self-fruitful, so one plant crops heavily alone. It is also one of the cold-hardiest citrus, taking brief dips to around 20°F, and it fruits young - many plants come home from the nursery already carrying fruit. Most distinctive of all, it is everbearing: instead of one ripening season it blooms in repeated flushes through most of the year, so a healthy plant usually carries fragrant flowers, hard green fruit, and ripe orange fruit at the same moment. That single fact reorganises how you grow and harvest it, and it is why calamansi does not belong under kumquat, where this catalog previously filed it - see the Grow section for the correction.
Quick facts
- Life cycle
- Perennial, lives about 50 years
- Height
- 10 ft4 to 20
- Spread
- 7 ft3.5 to 12
- Cold
- Takes light frostdamaged below 20°F
- Heat
- Struggles above 105°F
Full sun or part sun · medium water · well-drained soil · 8 ft apart (5 to 12) · transplant or cuttings
When to plant
No planting window on record for this zone. Nearest zone with one: 8b.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
One stage to settle in, then four that repeat each year. Windows are typical; your zone and weather move them.
First-year establishment
The first year after planting- WaterKeep evenly moist, never waterloggedevery 4 daysA new calamansi needs steady moisture to establish but hates soggy roots (root rot is the fast killer). Water deeply when the top inch or two dries; in containers, ensure free drainage and never let the pot sit in a saucer of water.
- MulchMulch a ring, kept well off the trunkA shallow mulch ring conserves moisture and feeds the shallow feeder roots, but keep it clear of the trunk - citrus get foot and crown rot if the base stays wet.
- ProtectProtect from hard freeze - but calamansi is hardy for citrusCalamansi is one of the cold-hardiest citrus, with mature plants shrugging off brief dips to about 20°F. It can go in the ground through zone 9 and in sheltered zone 8b spots; young plants still need frost cover, and container plants come in before the first freeze.
- FertilizeStart a citrus feeding programevery 45 daysCalamansi is a moderate feeder that crops almost continuously, so it needs feeding through the whole warm season rather than in one spring push. Use a citrus fertilizer with micronutrients (iron, zinc, manganese); yellowing leaves usually mean hunger or wet roots.
- InspectExpect leaf drop on a newly bought plantThe supermarket calamondin gift plant almost always sheds leaves in its first weeks. That is shock from the move into dry indoor air, not death. Give it the brightest window you have, keep the soil just moist, skip the fertilizer until it pushes new growth, and be patient.
Watch for- Root rot from soggy soil or a saucer left full
- Leaf drop after a move indoors (usually shock, not disease)
- Yellowing leaves (nutrient deficiency or overwatering)
- Citrus leaf miner on new flushes
Flushes of new growth
Mar, Apr, May, Jun, Aug, Sep, every year- FertilizeFeed steadily through the growing seasonevery 40 daysBecause calamansi flowers and fruits almost continuously, it is always drawing on reserves. Apply citrus fertilizer in split doses through the warm months rather than one heavy feed, and watch for micronutrient deficiency (interveinal yellowing = iron or manganese; overall pale = nitrogen).
- InspectProtect new flushes from pests and the greening vectorevery 10 daysThe tender new-growth flushes attract citrus leaf miner, aphids, and the Asian citrus psyllid that spreads citrus greening. Inspect each flush - this is the key scouting moment.
- PruneShape lightly whenever you likeCalamansi takes pruning better than almost any citrus and is naturally dense and shrubby, so it can be kept small for a pot, shaped, or even trained as a standard. Because it flowers on and off all year there is no wrong month - just avoid removing more than a quarter of the canopy at once.
Watch for- Citrus leaf miner trails in new leaves
- Aphids and psyllids on new growth
- Scale insects and sooty mold
- Spider mites on container and indoor plants
Bloom (repeatedly, most of the year)
Feb to Oct, every year- PollinateCalamansi is self-fruitful and sets heavily aloneOne plant bears a heavy crop by itself. Unusually for citrus, it blooms in repeated flushes through most of the year, so a healthy plant usually carries fragrant white flowers, hard green fruit, and ripe orange fruit all at the same time. Indoors, a light tap or a soft brush across the flowers helps set improve.
- WaterKeep water steady through bloom and setevery 4 daysBecause bloom is more or less continuous, so is the need for even moisture. Letting the plant dry out hard and then flooding it is the single commonest cause of flower and fruitlet drop on a container calamansi.
Watch for- Flowers, green fruit and ripe fruit on the plant at the same time - normal here
- Flower drop from erratic watering or a dry indoor room
- Small fragrant white blossoms in repeated flushes
Fruit sizing & colouring (rolling, not seasonal)
year-round, every year- WaterWater deeply and evenly as fruit fillsevery 5 daysSteady moisture fills the little fruit with juice, which is the entire crop. Drought at this stage gives dry, seedy fruit that yields almost nothing when squeezed.
- InspectWatch for scale, mites, and greening symptomsevery 2 weeksScale and spider mites build up steadily, especially on container and indoor plants, and citrus-greening symptoms (blotchy leaves, lopsided bitter fruit, twig dieback) would show. Inspect regularly.
Watch for- Fruit colouring from deep green through yellow-orange to orange
- Scale and spider mites, worse on indoor plants
- Ripe fruit softening and dropping if not picked
- Blotchy mottled leaves and twig dieback (citrus greening warning signs)
Harvest (year-round, peaking fall to spring)
year-round, every year- HarvestPick green for sharp juice, orange for mellow juiceweeklyUnlike most citrus there is no single ripe moment. Green-to-yellowish fruit gives the sharpest, most aromatic juice and is what most Filipino cooking uses; fully orange fruit is softer, milder, sweeter and gives more juice with a rounder flavour. Pick to taste and to use, taking a handful at a time - roll each fruit firmly on the counter first to free the juice.
- ProtectDon't leave ripe fruit hangingFully orange calamansi does not hold on the plant the way a kumquat or an orange does - it softens within a week or two and drops. Pick ripe fruit as it colours and juice the surplus for the freezer.
Watch for- Fruit at every stage on the plant at once - pick to the use, not the calendar
- Ripe orange fruit going soft and dropping within a week or two
- Bitter seeds inside - strain the juice
- Bitter, lopsided fruit signaling greening
Harvest
- For sharp cooking juice: fruit is full size, firm, and still deep green to yellow-green
- For mellow, sweeter juice: fruit is fully orange and gives slightly to a squeeze
- The fruit feels heavy and squashy-soft rather than hard - a hard, light fruit is dry inside
- Fruit is present in every stage at once, so pick to the dish rather than to a season
- Pick green for sharp juice, orange for mellow juice · weekly
- Don't leave ripe fruit hanging
Per plant 100 to 2000 calamansi, 1.9 to 50 lbPicking pick as they ripen
Cook with calamansi
Watch out for
5 to know. 1 is high-risk: Citrus Greening (Huanglongbing / HLB). 4 are active in September.
Citrus Greening (Huanglongbing / HLB)Severity High DiseasenowCalamansi is highly attractive to the Asian citrus psyllid and is used as an indicator plant in monitoring programmes, so a backyard calamansi in a quarantine region deserves close watching.
Never carry a plant or its fruit across a quarantine line, and buy only certified stock.
Asymmetric, blotchy yellow mottling on the leaves - the pattern does not match from one side of the midrib to the other, which is what distinguishes it from a nutrient deficiency - along with yellow-shoot dieback, small lopsided fruit that stays green at the stem end, bitter off-flavored juice, and the tiny Asian citrus psyllid feeding on new flushes.
There is no cure. An infected tree declines and dies and should be removed to stop the spread rather than nursed along. Management is entirely exclusion: clean stock, psyllid control, and destroying infected trees. Report a suspected case to your state agriculture department or extension office, which is how local quarantine programs track and contain it.
Buy only certified disease-free trees from a reputable source, and never move citrus plants, cuttings or fruit out of a quarantine area - that is how it travels between regions. Control the Asian citrus psyllid on new flushes, and remove infected trees promptly to protect the ones nearby. No resistant common variety exists yet.
The most serious citrus disease in the world, and effectively a death sentence for an infected tree. A bacterial infection (Candidatus Liberibacter) spread by the Asian citrus psyllid blocks the tree's vascular system, causing blotchy mottled leaves, yellow-shoot dieback, and small, misshapen, lopsided fruit that stays green at the stem end and tastes bitter. Every commercial citrus type is susceptible, there is NO cure, and it has collapsed much of Florida's citrus industry. It is the reason citrus plants and fruit are under quarantine restriction across much of the southern United States.
Scale & Sooty MoldSeverity Medium PestnowThe commonest pest of an indoor or patio calamansi, and easy to deal with on a plant this size - wipe the scales off by hand or with an alcohol swab before reaching for a spray.
Calamansi's dense shrubby interior is where it hides, so open the plant up when you prune.
Rows of small brown, tan, black, white, or waxy bumps along stems, twigs, leaf midribs, and leaf undersides that do not brush off but can be scraped loose with a fingernail. A sticky shine on the leaves - and on the floor, table, or path beneath the plant - that later turns black with sooty mold. Ants running steadily up and down the stems, since they farm and defend scale for that honeydew; often the first sign anything is wrong. Yellowing leaves, weak thin growth, and dieback of individual branches or canes that are heavily encrusted. On fruit crops, scale covers and sooty mold directly on the fruit. Check the leaf undersides and the shaded inner wood, which is where colonies build up unseen.
Horticultural oil is the main control: it works by smothering, so it has to coat the insects thoroughly - stems, twigs, and leaf undersides - and it usually needs repeating, because the waxy covering shields them and no single pass reaches everything. On deciduous woody plants a dormant-season oil smothers the overwintering stage while the leaves are out of the way, and timing a growing-season spray to the crawler stage, when the young are mobile and uncovered, is far more effective than spraying settled adults. On a small plant or a light infestation, scrub or wipe the scales off by hand, or dab them with a cotton swab of rubbing alcohol. Prune out and destroy badly encrusted wood rather than trying to save it. Wash off the sooty mold once the scale is gone - it lives on the honeydew, not on the plant, and stops once the supply does. Anything you spray must be labeled for the plant, and oils can burn delicate foliage, so test first.
Inspect. Look over leaf undersides and stems regularly - on a crop you pick, every harvest is a scouting chance - and check every new plant thoroughly before you buy it, plant it, or set it beside anything else, because scale almost always arrives on a plant rather than flying in. Quarantine new houseplants for a few weeks. Keep plants unstressed and not over-fertilized, since soft, forced growth is what populations build on. Prune for airflow and light to open up the shaded inner growth where scale hides, and prune out heavily infested wood as routine maintenance - on anything that gets a hard annual pruning, that alone removes most of any buildup. Leave the lady beetles, lacewings, and parasitic wasps alone, since they normally keep scale down to nothing, and keep ants off the plant where you can, because ants protect the colonies from those predators. Indoors, avoid hot, dry, still winter air.
Scale insects are sap-suckers that spend most of their lives immobile, fixed to a stem, twig, or leaf underside beneath a waxy or shell-like cover. They look far more like bumps, blisters, or crusty encrustations than like insects, which is why an infestation is usually well established before anyone notices it. Soft scales excrete large amounts of sticky honeydew that drips onto everything below and grows a black sooty mold - and those blackened leaves are often the first thing a gardener actually sees. Armored scales produce no honeydew but sit under a hard shield that protects them from most sprays. They spread as tiny mobile crawlers in the weeks after hatching, which is the only stage that moves and the only stage that is easy to kill. Populations build on stressed plants, on crowded shaded growth, and above all on plants kept indoors in dry, still air over winter.
Citrus Leaf MinerSeverity Medium PestnowBecause calamansi flushes repeatedly all year rather than twice a season, it offers the leaf miner a near-continuous supply of soft new growth, so mining shows up over a longer stretch than on other citrus.
On an established plant it is still cosmetic - trim the worst flushes rather than spraying.
Silvery, squiggling serpentine trails inside new leaves, and curled, twisted, distorted new growth on the flushes. Mature leaves and fruit are untouched.
Largely cosmetic on an established tree - prune off heavily mined flushes if you want to, and otherwise leave it alone rather than spraying for appearance. Horticultural oil applied to new flushes deters egg-laying. Systemic controls are used mainly on young trees or where canker pressure is high.
Established trees tolerate it, so the aim is to give it less to work with: avoid over-fertilizing, which pushes out the excess soft flushes it feeds on, and stop feeding by late summer so there is no tender autumn flush to mine. Encourage the parasitic wasps that control it, and protect young trees and new grafts, whose growth actually matters.
A tiny moth whose larvae mine winding, silvery serpentine tunnels just under the surface of new citrus leaves, curling, twisting and distorting them. It attacks only the tender new-growth flushes, never mature leaves or fruit, so on an established tree it is essentially cosmetic - but it can stunt a young tree, and the wounds it leaves in the leaf provide entry points for citrus canker bacteria, which is its real significance.
Spider MitesSeverity Medium PestThe number-one problem on an indoor calamansi, which is how most Americans grow it - dry heated winter air is exactly what mites want, so the active months here run through the heating season rather than only high summer.
Showering the whole plant in the sink every few weeks over winter prevents most outbreaks.
Fine pale stippling or speckling across the upper leaf surface, as though the color had been sandblasted out of it, and later a dull bronze or rusty cast over the whole leaf. Delicate webbing across leaf joints, shoot tips, and undersides - that comes with a heavy infestation and means you caught it late. Leaves that dry, curl, and drop early while the plant looks thirsty no matter how much you water it. Hold a leaf over a sheet of white paper and tap it: the specks that fall and then start walking are mites. With a hand lens, look on the undersides for the mites themselves, pale or reddish, and their round translucent eggs. Damage that shows up first on the hottest, dustiest, most sheltered side of a plant, or on a pot sitting near a radiator indoors.
Start with water. A strong jet aimed at the leaf undersides, repeated every few days for a couple of weeks, knocks populations down and breaks the cycle - on many plants that alone ends it. On anything that regrows quickly, shearing back badly infested growth resets the plant to clean foliage. If it keeps building, spray insecticidal soap or horticultural oil directly onto the undersides where the mites actually live, and repeat every five to seven days for three rounds: contact sprays do not kill the eggs, so a single application always fails. Anything you spray must be labeled for the plant you are treating - follow the label and observe its pre-harvest interval on anything you eat. Predatory mites are an effective release in a greenhouse or on an indoor plant. Above all, correct the heat, dust, and drought stress that caused it, or the mites simply come back.
Do not let plants get drought-stressed - that is the single strongest trigger, and a plant watered steadily through heat is far less likely to have a mite problem at all. Hose the foliage down, undersides included, during hot dry spells: it knocks mites off, washes away the dust they thrive in, and raises the humidity around the plant for a while. Indoors and under cover, keep the air from going hot, dry, and stagnant, wipe or rinse the leaves occasionally, and keep pots away from radiators and heating vents. Inspect any plant carefully before you bring it indoors for winter or set it among others, since mites almost always arrive on something else. Avoid broad-spectrum insecticides: they wipe out the predatory mites, lacewings, and lady beetles that do most of this work for you, and reliably leave you with a worse outbreak than you started with.
Spider mites are not insects but tiny sap-feeding arachnids, smaller than a grain of salt, and you almost always notice the damage before you notice them. They live on the undersides of leaves and drain the cells one at a time, which is why the leaf goes finely stippled with pale dots before it bronzes and dries. They breed explosively in hot, dry, dusty, still air - a generation can pass in a week at high temperature - so a barely visible population becomes a webbed, bronzed plant within a fortnight. Drought-stressed plants and plants wintered indoors in dry heated air are the classic hosts. Broad-spectrum insecticides make matters worse rather than better, because they kill the predatory mites and lady beetles that normally hold mites in check.
AphidsSeverity Low PestnowOn citrus this rides the tender new flushes and distorts them, and some species transmit citrus viruses.
On a small potted calamansi a jet of water in the sink or a wipe with your fingers usually ends it without any spray at all.
Dense clusters of tiny insects packed onto shoot tips, flower buds, and the undersides of young leaves. Curled, cupped, or distorted new growth that never opens properly. A sticky shine on the leaves - and on whatever sits under the plant - that later goes black with sooty mold. Tiny white cast skins left behind where a colony has been feeding. Ants running steadily up and down the stems, which is often the first thing you notice. Mottled, streaked, or misshapen leaves that do not grow out can mean a virus the aphids brought with them rather than the feeding itself.
Knock the colonies off with a hard jet of water and repeat every few days - on most plants that alone ends it. Pinch out or prune off the worst-infested tips rather than treating the whole plant. If colonies keep rebuilding, spray insecticidal soap or horticultural oil directly onto the insects, covering leaf undersides, and repeat weekly until they are gone; treat early or late in the day, and never spray a wilted or heat-stressed plant. Avoid broad-spectrum insecticides - they kill the ladybugs, lacewings, and parasitic wasps that were about to solve the problem for you, and aphid numbers usually come back worse afterward. Anything you spray must be labeled for the plant you are treating; follow that label and observe its pre-harvest interval. On anything you eat, wash leaves, heads, and buds well before use, since aphids hide down in crowns, folds, and tight growth.
Go easy on nitrogen: the soft, lush growth that heavy feeding produces is exactly what aphids breed on. Check new growth once a week through spring and early summer so you catch colonies while they are still small, and rub the first few out with your fingers. Leave flowering plants nearby and skip broad-spectrum sprays - ladybugs, lacewings, hoverflies, and parasitic wasps do most of this work for free, and they only stay if there is something for them to eat. Keep ants off the plant where you can, since they protect aphids from those predators. Water steadily so plants are not stressed, and check any new plant over before you bring it home or move it indoors, since aphids usually arrive on something else.
Aphids are small soft-bodied sap-suckers - green, black, gray, pink, or waxy white, and mostly wingless - that gather in dense colonies on the tenderest new growth: shoot tips, buds, and the undersides of young leaves. They breed extremely fast in mild weather, so a few can become hundreds inside a week. Their feeding curls and distorts soft growth, and the sticky honeydew they excrete coats everything below and turns black with sooty mold. Ants often farm and defend the colonies for that honeydew. A few aphids are normal on almost any plant and a healthy plant shrugs them off; only dense, persistent colonies do real damage, and some aphids also spread plant viruses as they feed.
Good & bad neighbors
All of these are traditional pairings. The evidence is thin, so treat them as a nudge, not a rule.
Plant nearby
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A living clover groundcover fixes nitrogen for a continuously cropping plant and feeds pollinators; keep it and any mulch off the trunk base to avoid foot rot.
-
Draws beneficial insects and is traditionally credited with deterring some pests around citrus; French types also suppress root-knot nematodes. Harmless under a young plant or beside a container.
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Grown around citrus as a trap crop and to draw aphids and beneficial insects away from the tender new flushes; a common, harmless citrus underplanting.
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A natural Southeast Asian kitchen pairing and a tough, sun-loving clump that likes the same warm conditions; a good container-grouping neighbour on a patio.
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A low, drought-tolerant, pollinator-friendly herb that suits a sunny calamansi and makes a tidy underplanting or a companion in a large pot.
Varieties · 2
You pick one when you add Calamansi to your garden. Its days to maturity set your harvest window.
Standard calamansi (calamondin)
Small dense evergreen shrub carrying marble-sized round fruit at every stage from deep green through yellow to bright orange, with thin, glossy, easily-torn skin.
everbearingself-fruitfulcold-hardycontainerThe ordinary, unnamed calamansi that makes up nearly all plants sold, whether labelled calamansi, calamondin, Philippine lime or musk lime. A dense, compact, nearly thornless shrub that flowers and fruits in repeated flushes through most of the year, carrying blossom, green fruit and ripe orange fruit simultaneously. Fruit is round, about an inch across, thin-skinned, with two to five bitter seeds and roughly a tablespoon of sharply tart, aromatic juice. Unlike most citrus there is no meaningful cultivar choice to make here - this is what you will be offered and it is what you want.
Variegated calamondin
Compact shrub with cream-margined green leaves; young fruit striped green and cream in the manner of a tiny watermelon, ripening to solid orange.
variegatedornamentaleverbearingself-fruitfulA widely sold ornamental form with cream-and-green variegated foliage, and - the striking part - immature fruit boldly striped in green and cream, which fades to plain orange as it ripens. The fruit is fully usable and tastes the same as the standard type, so this is a genuine dual-purpose plant rather than a purely decorative one. Grows a little more slowly and crops somewhat lighter than the plain form, as variegated plants generally do, and the pale tissue scorches more easily in fierce sun, so give it a touch of afternoon shade in hot inland climates. The best choice where the plant is on display.
Grower tips
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