Robinia × slavinii 'Hillieri'

RHS Plant Profile

locust tree 'Hillieri'

Synonyms

Robinia pseudoacacia 'Hillieri'
Robinia × hillieri hort.

Trees Shrubs

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A deciduous tree or large shrub, with an open, rounded habit to 10m high. Leaves are dark green and pinnate, made up of up to 19 leaflets. Produces long clusters of fragrant, pale lilac-pink flowers in late spring, followed by long brown seed pods.

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity: 10–20 years
Max Spread: wider than 8 metres
Max Height: 8-12 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Full sun

Aspect: 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): H6

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Fabaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Potentially harmful: Harmful if eatenskin irritant. Wear gloves and other protective equipment when handling Pets: Harmful if eatenskin irritant - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Robinia are vigorous suckering trees and shrubs, sometimes thorny, with pinnate leaves and racemes of pea-type flowers in early summer, sometimes followed by seed pods
Name Status: Accepted

How to Grow

Cultivation

Prefers moderately fertile, moist but well-drained soil, but will tolerate poor, dry soils. Choose a spot that is sheltered from strong winds, as branches are brittle.

Propagation

Propagate by division, removing suckers in autumn, or by root cuttings or grafting in winter

Suggested planting locations and garden types

Architectural
Cottage and informal garden

Pruning

Pruning group 1; prune in late summer or early autumn to prevent bleeding

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus