Lonicera sempervirens f. sulphurea 'John Clayton'

RHS Plant Profile
trumpet honeysuckle 'John Clayton'

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Compact, semi-evergreen, woody, twining climber about 2.5-3m tall, with paired, oval, dark green leaves, downy blue-green beneath. Very floriferous, tubular, 2-lipped pale yellow flowers are produced towards the ends of the stems in summer, followed by red berries

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

2.5-4 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1.5-2.5 metres
Max Height
2.5-4 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–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

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Caprifoliaceae
Native to GB/Ireland
No
Foliage
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
Accepted

How to Grow

Cultivation

Climbing honeysuckles grow best in partial shade but tolerates full sun, and thrives in any fertile, moist but well-drained soil. See honeysuckle (climbing) cultivation

Propagation

Propagate by layering, softwood cuttings, semi-ripe cuttings, leaf-bud cuttings and hardwood cuttings

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Cottage and informal garden
  • Climber and wall shrubs
  • Wall side borders

Pruning

Pruning group 11 after flowering

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)