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Alpine RockeryHerbaceous Perennial

Achillea millefolium 'Proa'

A hardy, clump-forming perennial to around 80cm in height, with finely divided, aromatic green foliage. Flat clusters of fragrant, pure white flowers appear from summer to early autumn. Excellent drought tolerance once established. Selected for its high essential-oil content and vigorous growth, it is ideal for borders, naturalistic plantings, and pollinator-friendly gardens

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Ultimate height

0.5–1 metres

Time to ultimate height

1–2 years

Ultimate spread

0.1–0.5 metres

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or South–facing or West–facing

Exposure

Exposed or Sheltered

Drought resistance

Yes

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)

Botanical details

Family: Asteraceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy, Clump forming
Genus: Achillea can be mat-forming or upright perennials, mostly herbaceous, with sometimes aromatic, pinnately divided or simple and toothed leaves and flattened clusters of small, daisy-like flower-heads
Name status: Accepted

How to grow

Cultivation

Grow in an open, sunny position in well-drained soil

Propagation

Propagate by seed or by division in the spring. Sow inside from March to May or outside after the last frosts until June

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Gravel garden
Patio and container plants
Rock garden
Wildflower meadow
Wildlife gardens
Flower borders and beds
Underplanting of roses and shrubs

Pruning

Cut back after flowering

Pests

May be susceptible to aphids

Diseases

May be susceptible to powdery mildews

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