Kumquat
Citrus japonica · Rutaceae
📷 Wikimedia Commons · Public domain
⚠️ La pulpe mûre est comestible. Feuilles, tiges, écorce et peau du fruit contiennent des huiles essentielles et psoralènes pouvant causer troubles digestifs ou irritation chez chiens et chats.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around kumquat and prepare for winter.
ID card
- Foliage
- Evergreen, dark green and glossy
- Flowering
- May to June, fragrant white flowers
- Mature size
- 1.2 to 1.5 m in height
- Growth
- Slow to moderate
- Hardiness
- Tender (minimum −5 °C)
- Origin
- China and Japan
- Fruits
- Small oval citrus fruits, edible
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Citrus japonica performs better in a pot (easy winter mobility) or in well-drained soil. Light feeding in spring-summer is sufficient.
The common mistake
Growing only in open ground in cool climates without winter protection: roots freeze before the branches.
The pro's trick
Apply a mulch of leaves or straw around the base in November to insulate the roots.
Seasonal watch
Fall: gradually reduce watering to harden the plant before winter.
Care
Light exposure
Your kumquat needs full sun exposure to flower and fruit abundantly. Place it in a bright location with at least 6 hours of direct sunlight daily. In cold regions, growing it in a pot or greenhouse is recommended during winter.
Watering
Water regularly during the growing season to keep the substrate slightly moist, never waterlogged. In winter, space out waterings and reduce frequency. Use non-limey water if possible to prevent nutrient deficiencies.
Soil and repotting
Choose well-draining potting mix, slightly acidic to neutral, enriched with organic matter. Repot every 2 to 3 years in spring, using a slightly larger pot. Good drainage is essential to prevent root rot.
Fertilizing
Fertilize every 15 days or so from April to September with balanced fertilizer or one specifically for citrus. Reduce or stop feeding in autumn-winter. Adding trace elements (magnesium, zinc) can improve fruit quality.
Pruning and training
Prune lightly in spring to maintain a balanced shape and encourage branching. Remove dead or poorly placed branches. Avoid severe pruning that reduces flowering and fruiting.
Pests and diseases
Watch for scale insects, spider mites, and aphids, which are common on indoor citrus. Excess humidity can promote fungal development. Ventilate regularly and inspect foliage to act quickly if problems appear.
Did you know?
The kumquat is one of the few citrus fruits you can eat entirely, skin included. Its Japanese name "kumquat" literally means "golden orange" (kin = gold, kwat = orange). Imported to Europe in the 19th century, it first captivated the Victorians before becoming popular in modern Mediterranean and Asian cuisines.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.