Lonicera japonica

RHS Plant Profile

Japanese honeysuckle

Other common names

gold and silver flower

Climber Wall Shrub

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This plant is listed as an invasive non-native species in Northern Ireland – see Cultivation section for details. A vigorous, woody, evergreen to semi-evergreen twining climber about 10m tall, with dark green leaves to 8cm long, often deeply lobed on young growth. Tubular two-lipped, fragrant white flowers, ageing to yellow, are produced in pairs from the leaf axils from spring to late summer, followed by blue-black berries

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

8-12 metres

Max Spread

4-8 metres

Size

Time to Maturity: 5–10 years
Max Spread: 4-8 metres
Max Height: 8-12 metres

Growing Conditions

Clay Loam

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or North–facing or South–facing or West–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): H5

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Caprifoliaceae
Native to GB/Ireland: No
Foliage: Evergreen, Semi evergreen
Habit: Climbing
Potentially harmful: Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling. Pets: Fruit are ornamental - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Lonicera can be deciduous and evergreen shrubs, or climbers with twining stems. The tubular or two-lipped flowers, often very fragrant, are followed by red or black berries
Name Status: Correct
Plant Range: China Manchuria Japan Korea

How to Grow

Cultivation

This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act (Northern Ireland) as an invasive non-native species. Although not banned from sale, it is an offence to plant or cause these to grow in the wild IN NORTHERN IRELAND. Gardeners possessing them should undertake measures to control them. See RHS advice on invasive non-native species for further information Climbing honeysuckle grows best in partial shade but tolerates full sun, and thrives in any fertile, moist but well-drained soil. See honeysuckle (climbing) cultivation

Propagation

Please see cultivation notes

Pests

May be susceptible to honeysuckle aphids, Thrips and glasshouse whitefly

Diseases

May be susceptible to powdery mildews, fungal leaf spot, silver leaf and honey fungus (rarely)