Kumquat (Citrus japonica 'Centennial Variegated') is a small, evergreen shrub native to southern and eastern Asia, where it first appeared in Chinese literature during the 12th century. This hardy citrus grows 7 to 10 feet tall and 5 to 8 feet wide, thriving in zones 9 through 11 and producing fragrant white flowers in late spring followed by small, edible orange fruits. Its dense, glossy foliage and ornamental fruit make it a dual-purpose plant that works equally well in the garden or in containers, especially in cooler climates where it can be moved indoors during winter.
Full Sun
Moderate
9-11
120in H x 96in W
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Moderate
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The kumquat's ancient lineage stretches back over eight centuries, documented in Chinese literature as a treasured subtropical fruit. In late spring, delicate white flowers emerge from the leaf axils with a rich fragrance, and self-pollinating readily without requiring a second tree. The small, round to oval fruits arrive in vibrant orange, displaying themselves against the plant's dark green, glossy leaves while remaining entirely edible straight from the branch. Thin, dense branching creates a naturally compact form, though gardeners should watch for thorns on new growth, particularly on the branches.
The kumquat's small, sweet-tart fruits are eaten fresh, often whole with the thin, edible skin, making them distinct among citrus crops. In its native Asian traditions and modern gardens alike, the plant serves both culinary and ornamental purposes, with the showy orange fruits providing visual appeal while yielding food throughout the growing season.
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Transplant containerized kumquats outdoors after all danger of frost has passed in zones 9 through 11. In cooler climates, wait until nighttime temperatures remain above 50 degrees Fahrenheit. Space plants 5 to 8 feet apart to accommodate their mature width, allowing room for air circulation through the dense branching.
Harvest kumquats when the fruits reach full orange color and feel slightly soft to gentle pressure, typically in summer and early fall. The entire fruit is edible, skin and all, so pick at peak ripeness for the best balance of sweetness and tartness. Simply twist the fruit gently from the branch or use pruning shears to avoid damaging the wood.
Prune to maintain the naturally dense, compact form or shape to fit your garden space. Remove dead or diseased wood, and thin crowded interior branches to improve air circulation, which helps reduce pest and disease pressure when grown indoors. The plant's natural branching habit requires minimal pruning, though you may want to remove thorny growth in high-traffic areas for safety.
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“Kumquat holds the distinction of being one of the oldest documented citrus cultivars, with records of its cultivation appearing in Chinese literature as early as the 12th century. Native to southern and eastern Asia, this small tree was prized in its homeland for centuries before reaching Western gardens. The variety documented here represents the 'Centennial Variegated' selection, continuing a line of cultivation that spans hundreds of years and reflects how this species adapted to diverse growing conditions across multiple continents.”