Molinia caerulea subsp. arundinacea

RHS Plant Profile

purple moor-grass

RHS

Synonyms

Molinia 'Arundinacea'
Molinia altissima
Molinia litoralis

Grass Like

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A tussocky, deciduous grass with arching, linear leaves that turn yellow in autumn, and fine sprays of small, purplish flowers in summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 1-1.5 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Full sun Partial shade

Aspect: South–facing or East–facing or North–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: Poaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Tufted
Genus: Molinia are deciduous perennial grasses, tufted in habit, with flat, linear leaves and erect stems bearing open flowering panicles in summer
Name Status: Correct
Plant Range: W Europe

How to Grow

Cultivation

Will grow in any moderately fertile, moist but well-drained soil but prefers acidic soil

Propagation

Propagate by seed sown in pots in a cold frame in spring or by division in spring

Suggested planting locations and garden types

Cottage and informal garden
Low Maintenance
Flower borders and beds

Pruning

Remove dead foliage and old flowered stems in spring

Pests

Generally pest-free

Diseases

Generally disease-free