Achillea × kolbiana

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Alpine Rockery Herbaceous Perennial
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A tough, resilient species of evergreen to semi-evergreen alpine perennial to around 15cm in height, forming a mound of aromatic, silvery-green, soft, ferny, deeply lobed foliage which turns almost white in periods of drought. Clusters of pure white, flat-topped, 5-petalled flowers appear in April to May. A great addition to rock and alpine gardens and borders and drought-tolerant once established. Attracts bees, butterflies and other beneficial insects

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Well–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
Drought Resistance
Yes

Colour & Scent

Fragrance Foliage
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Evergreen, Semi evergreen
Habit
Matforming, Spreading branched
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
Correct

How to Grow

Cultivation

Grow in an open, sunny position in well-drained soil. Dislikes being waterlogged. See achillea cultivation for further advice

Propagation

Propagate by division in spring

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Gravel garden
  • Prairie planting
  • Rock garden
  • Wildlife gardens
  • Ground cover

Pruning

deadhead regularly to prolong flowering

Pests

May be susceptible to aphids

Diseases

May be susceptible to Powdery mildews