Tree · Rutaceae
Mandarin Orange
Citrus reticulata
Give it full sun, free-draining soil, and shelter from hard frost, and a mandarin tree rewards you with fragrant blossom and easy-peel fruit.
Full sun
Every 5–10 days
55–100°F · 13–38°C
USDA 8–11
Overview
The mandarin is the easy-peel, loose-skinned member of the citrus family, and the parent of clementines, satsumas, tangerines, and a long line of hybrids. It traces back to southeast Asia and grows as a small evergreen tree, glossy-leaved year round and heavy with fragrant white blossom in early spring. The fruit ripens through fall and winter, which makes it the citrus that shows up just as everything else in the garden goes quiet.
These trees take a bit of care but no expert touch. They want full sun, well-drained soil, and steady moisture, and they grow happily either in the ground in mild regions or in a large pot you can move under cover when the cold rolls in. Most fruiting mandarins are grafted, so the variety on the label is joined to a tough rootstock that handles the soil and shrugs off disease.
Cold is the one thing a mandarin can't laugh off, and how much it minds depends on the type. Satsuma stands well ahead of the rest for cold hardiness, taking brief dips that would finish most citrus, while clementines and the various hybrids ask for a warmer, more sheltered spot. Match the variety to your winters and the rest of the growing is straightforward.
Care
The short version: full sun, free-draining soil rich in organic matter, and water that keeps the roots moist without ever sitting wet. Feed with a citrus fertilizer through the growing season, prune only lightly, and shield young trees from hard frost.
Light
Mandarins want full sun, ideally 8 or more hours a day, to ripen sweet fruit and stay dense and healthy. They'll take a little partial sun, but shade thins the canopy and cuts the crop.
Water
Let the top inch (3 cm) of soil dry between waterings, then water deeply, roughly every 5 to 10 days depending on heat and pot size. Young and container trees drink more often, while established in-ground trees handle dry spells but fruit best with steady moisture. The thing to avoid is soggy roots, which citrus hates.
Soil
Plant in well-drained sandy loam with plenty of organic matter worked in. A slightly acidic pH of 6.0 to 6.5 keeps the micronutrients available, and sharp drainage matters more than richness, since standing water rots the roots.
Temperature
Mandarins grow across a wide band, from about 55°F to 100°F (13°C to 38°C). They do their best work in warm weather, but hard frost is the real danger, so pick a cold-hardy type or be ready to protect the tree when temperatures drop.
Humidity
Average humidity around 40% to 60% suits them well, no misting required. Good airflow through the canopy does more good than chasing a number, since it keeps pests and mold from settling in.
Feeding
Feed from spring through late summer while the tree is in active growth, using a citrus fertilizer that carries micronutrients. The magnesium, manganese, iron, and zinc in a citrus blend head off the yellow, blotchy leaves that come from a bare diet.
Pruning
Keep pruning light. In late winter to early spring, take out dead, damaged, or crossing branches and any suckers sprouting below the graft union, since those suckers belong to the rootstock and not your fruit.
Repotting
Move container trees into a larger pot every 2 to 3 years, or when roots circle the inside, push out the drainage holes, or water races straight through. Refresh the mix at the same time to keep growth steady and the leaves green.
Size & spacing
A mandarin matures into a small tree of about 10 to 20 feet (3 to 6 m) tall with a spread of 8 to 15 feet (2.4 to 4.5 m). Give it that much open room, or keep it smaller and shapely in a large container.
When to plant
A mandarin runs on a long, slow clock. Plant it out in spring once the danger of frost has passed, watch for fragrant blossom in early spring, and wait for the fruit to color up and sweeten from fall into winter, roughly November through January.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring after danger of frost has passed
- Harvest: Blooms in early spring; fruit ripens fall to winter (about November to January)
Hardiness
USDA hardiness zones: 8–11
Temperature: down to -12°C
Troubleshooting
Most mandarin trouble shows in the leaves first, whether from a missing nutrient, a cold snap, or insects feeding underneath. Learn to read those early signs and you can step in before the tree loses ground. Match what you see below, then act while it still helps.
Yellow leaves with green veins still showing
This pattern points to a micronutrient deficiency, usually iron, manganese, or zinc, and it often traces back to soil that runs too alkaline for the roots to pull those nutrients in. Test the soil and nudge the pH back toward 6.0 to 6.5, then spray a chelated micronutrient feed on the leaves to green them up while the soil corrects.
Fix:
- Apply a chelated micronutrient foliar spray
- Adjust soil pH toward 6.0 to 6.5
Leaves dropping and twigs dying back after a cold snap
This is freeze or frost injury, and you'll see it after a hard cold event when the tissue browns or wilts. Hold off on cutting anything until spring, because wood that looks dead can push new growth once the weather warms, and only then can you tell what's truly gone. Cover young trees during freezes and lean on cold-hardy types like satsuma to avoid the worst of it.
Fix:
- Wait until spring to prune out clearly dead wood
- Provide cold protection during freezes
Sticky leaves under a film of black sooty mold
The mold itself is harmless, but it's growing on honeydew left behind by sap-sucking insects such as aphids, scale, or whitefly. Check the leaf undersides and stems to find the culprits, wash the foliage to clear the sticky coating, and treat with horticultural oil or insecticidal soap. Keep an eye out for ants too, since they farm these pests for the honeydew and will fight off the predators that would otherwise help.
Fix:
- Wash foliage to remove mold and honeydew
- Apply horticultural oil or insecticidal soap
Toxicity
The peeled flesh is a healthy, juicy snack for people, but the rest of the plant is a different story for animals. The peel, leaves, stems, and seeds hold essential oils and psoralens that irritate the gut and the skin. Keep peelings and prunings away from pets and grazing animals, and call a vet if a large amount goes down.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Mild
A cat that chews the peel or leaves usually gets an upset stomach, with vomiting, loose stool, and a flat, low mood. The essential oils can also leave the skin red or itchy where they touch it.
Dogs Mild
Expect mild stomach trouble after a dog gets into the peel, leaves, or seeds, mostly vomiting and diarrhea along with some sluggishness. The oils may irritate the skin too, though most dogs shrug off small nibbles.
Horses Mild
The same oils and psoralens in the peel and foliage give horses an irritated gut and a dull, off-feed spell. They rarely seek citrus out, so trouble tends to follow trimmings left within reach.
Rabbits Caution
The peel, leaves, and seeds carry the same irritating oils, so it's safest to keep them out of the hutch. A small piece of the flesh now and then is fine as a treat.
Livestock Caution
Goats, sheep, and cattle can take a sour turn from the oils in the peel and prunings, with reduced appetite the usual first sign. Keep clippings out of the pasture rather than letting animals browse them.
Birds Caution
The fragrant oils concentrated in the peel and leaves don't sit well with birds, so offer only a little of the flesh and skip the rind entirely.
People Flesh safe
The juicy segments are a healthy snack and safe to eat. Handling a lot of peel can leave sensitive skin tingling or sun-sensitive from the oils, so wash up after peeling a big batch.
The fruit flesh is generally low risk, but peels, leaves, and seeds contain irritating essential oils
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Mandarin covers a wide family of easy-peel citrus, from the cold-hardy satsumas to sweet little clementines and a run of hybrids. These are the ones worth knowing by name.
Satsuma (Citrus unshiu)
The cold-hardiest mandarin of the bunch, with easy-peel, nearly seedless fruit and the nerve to shrug off brief dips near 15°F (-9°C).
Owari
The leading satsuma cultivar, grown commercially across northern Florida for its reliable crops.
Clementine
A small, sweet, easy-peel mandarin from the Mediterranean group that's become the lunchbox favorite.
Tangelo
A cross between a mandarin and grapefruit or pummelo, blending sweet citrus with a tangy edge.
Tangor
A cross between a mandarin and a sweet orange, richer and fuller in flavor than either parent.
How to propagate
Mandarins are multiplied two ways, and the choice comes down to whether you want the same fruit you started with or a slow experiment.
GraftingModerate
Spring or late summer · Bears fruit in about 2 to 4 years
Grafting is the commercial standard, and for good reason. Done in spring or late summer, it joins your chosen variety to a vigorous, disease-resistant rootstock so the tree comes up sturdy and bears true-to-type fruit in about 2 to 4 years. It takes a steady hand, but nothing else gives you the same reliable result.
SeedEasy
Spring · Several years and may not be true to type
Growing from seed is easy enough to start in spring, but it asks for patience and a willingness to gamble. Mandarin seeds are often polyembryonic, yet the seedlings come up slow and variable and can take several years to fruit, often not true to the parent. It's a fun experiment, not the way to copy a variety you love.
Myths
Citrus is completely safe to share with cats and dogs.
The ASPCA lists orange and citrus as toxic to pets, because the peel, leaves, and seeds hold essential oils and psoralens that upset the stomach. The juicy flesh is low risk in small amounts, but the rind and foliage are the parts to keep away from cats and dogs.
All mandarins are equally tender in the cold.
Hardiness varies a lot across the group. Satsuma mandarins stand out for taking brief temperatures near 15°F (-9°C), far colder than most other citrus will tolerate, which is why they're the type to reach for in a borderline climate.