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Citrus medica (F)

citron

A large spiny evergreen shrub with deep green, ovate leaves and small clusters of fragrant white flowers 3.5cm across and flushed pink externally, followed by lemon-shaped, yellow fruits to 30cm in length

Other common names

bush ukan
cedrat
see morecedro
cheu yuan
cidra
citron oil plant
sweet lime

Synonyms

Citrus medica 'Wisley'
Citrus sudachi

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Plant nurseries
3 suppliers

Ultimate height

2.5–4 metres

Time to ultimate height

10–20 years

Ultimate spread

1.5–2.5 metres

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

West–facing or South–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Rutaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Fruit harmful to skin with sunlight/skin allergen. Wear gloves and other protective equipment when handling
Genus: Citrus are typically evergreen shrubs or trees, frequently spiny, with simple, leathery, aromatic leaves, usually with winged stalks, and often fragrant white or pink-tinged flowers, followed by large, juicy fruits
Name status: Correct

How to grow

Cultivation

Grow as a conservatory or greenhouse plant, in a container of peat-free, loam-based potting compost with added grit, in full light, with shade from hot sun. In growth during spring and summer, water freely, and mist daily. Apply fertilisers formulated for citrus, throughout the year, following the manufacturer’s instructions; water sparingly in winter. See citrus cultivation for further information

Propagation

Propagate by seed (seedlings will not come true to type) or semi-hardwood cuttings

Suggested planting locations and garden types

Architectural
City and courtyard gardens
Patio and container plants

Pruning

Pruning group 1

Pests

May be susceptible to citrus red spider mite and glasshouse red spider mite, soft scale and fluted scale, aphids, caterpillars and mealybugs under glass

Diseases

Generally disease-free

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