Kumquats are small citrus fruits usually eaten with the peel. The aromatic rind tastes sweeter than the tart interior, creating the sweet-sour flavor that makes kumquats useful for fresh eating, preserves, sauces, baking, and garnishes.
What Is a Kumquat?
Kumquats are commonly classified as Citrus japonica; older references may use the genus Fortunella. Fruit shape, seed count, rind thickness, flavor, and cold tolerance vary by cultivar. Nagami is typically oval and tart, while Meiwa is usually rounder with a sweeter eating quality.
How to Eat and Use Kumquats
- Use ripe fruit that has developed the color and flavor expected for the cultivar.
- Wash it under running water and dry it.
- Roll the fruit gently between the fingers to release rind oils, then eat it whole or slice it.
- Remove seeds if their bitterness or texture is undesirable.
Kumquats can be candied, cooked into marmalade, added to chutneys or sauces, baked, or sliced into salads. Follow tested food-preservation recipes when canning.
Growing a Kumquat Tree
Light and Site
Choose full sun with good air movement and well-drained soil. In hot interior climates, young trees may need gradual acclimation and trunk protection. Leave enough space for the cultivar and rootstock rather than relying on a fixed mature size.
Containers
Use a pot with unobstructed drainage holes and a citrus-suitable container mix. Start with a container only moderately wider than the root ball. Move the tree before temperatures fall below the tolerance stated for the cultivar and rootstock; cold hardiness varies, and potted roots are more exposed than roots in the ground.
Water
Water deeply, then allow the upper part of the root zone to begin drying before watering again. Frequency changes with pot size, soil, weather, canopy, and season. Do not leave a container standing in collected water.
Fertilizer
Use a fertilizer labeled for citrus and follow its rate and timing. Container trees may need smaller, more frequent applications than in-ground trees, but salt buildup is also a risk. Yellow leaves can result from water, roots, pH, temperature, or pests—not only a nutrient deficiency.
Pruning and Pests
Remove dead, damaged, crossing, or rootstock-sucker growth with clean tools. Avoid heavy pruning that exposes previously shaded bark. Inspect new growth and leaf undersides for scale, mites, aphids, leafminers, or other citrus pests, then identify the problem before treating.
Flowering and Harvest
Flowering and fruit set depend on light, temperature, tree maturity, nutrition, and plant health. Harvest timing varies by cultivar and climate. Color is a useful clue but not a complete test, so taste one fruit before picking the crop. Clip fruit when pulling would tear the rind or twig.
Choosing a Tree
Check the product page for cultivar, rootstock, tree form, shipping restrictions, recommended climate, and whether the plant may arrive dormant or recently pruned. Compare current options in the citrus tree collection.
Kumquats contribute vitamin C and fiber as whole fruit, but nutrient content varies with serving size and source. Treat them as food rather than as a prevention or cure for illness.