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Saxifraga callosa (8) AGM

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© RHS 1985

Characteristics

Plant type

Alpine/Rockery

Habit

Clump-forming

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

White in Summer

Foliage

Grey/Silver in Autumn, Spring, Summer and Winter

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0-0.1 metre

Time to ultimate height

2-5 years


Preferred common name

limestone saxifrage

Family

Saxifragaceae


Saxifraga can be annuals, biennials, evergreen or herbaceous perennials, mostly mat-forming in habit, with simple or palmately lobed leaves and starry or rounded flowers which may be solitary of in panicles or cymes

Ligulatae section saxifrages are evergreen perennials forming monocarpic rosettes, usually clustered, of narrowly strap-shaped or oblong, lime-encrusted leaves, with sprays of small white, pale yellow or pink flowers in late spring or early summer

S. callosa is an evergreen perennial with rosettes of linear, lime-encrusted silvery-grey leaves to 8cm in length. Starry white flowers 1cm in width are carried in large open panicles on arching stems to 25cm

Synonym(s)

  • Saxifraga callosa lingulata
  • Saxifraga lingulata

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or East-facing
  • Exposed

Cultivation

Grow in moderately fertile, very well-drained, alkaline soil in full sun. May be intolerant of winter wet, can be grown in a pot in an alpine house

Soil

  • Well-drained
  • Alkaline
  • Chalk

Propagation

Propagate by seed sown in pots in an open frame in autumn. Propagate by detaching rosettes and rooting as cuttings in late spring or early summer

Suggested planting locations and garden types

Gravel Garden, Patio/Container Plants or Rock Garden


How to care

Pruning

No pruning required

Pests

Aphids, slugs, vine weevil and glasshouse red spider mite may be a problem

Diseases

Generally disease free