Lythrum salicaria 'Robin'

RHS Plant Profile

purple loosestrife 'Robin'

Herbaceous Perennial

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A clump-forming perennial with strongly upright, branching stems to 90cm tall, clad with narrowly lance-shaped leaves. Spikes of deep pink to purple-pink star-shaped flowers are produced over a long period during the summer

Position

Full sun

Soil Types

Clay, Loam

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1–2 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Clay Loam

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

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Exposed or 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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lythraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming, Columnar upright
Genus: Lythrum can be annuals or herbaceous perennials, with simple leaves in opposite pairs and small star-shaped flowers in leafy racemes
Name Status: Accepted

How to Grow

Cultivation

Grown in any reliably moist or even wetter soil in full sun

Propagation

Propagate by division in spring

Suggested planting locations and garden types

Cottage and informal garden
Wildlife gardens
Wildflower meadow
Flower borders and beds

Pruning

Deadhead after flowering

Pests

May be susceptible to slug and snail damage

Diseases

Generally disease-free