Salvia × sylvestris 'Crystal Blue'PBR (Color Spires Series)

RHS Plant Profile
wood sage 'Crystal Blue'

Save a plant

Where do you want to save Salvia × sylvestris 'Crystal Blue'PBR (Color Spires Series)?

Plants I own
Wishlist
Go to My Plants
wood sage 'Crystal Blue' RHS
wood sage 'Crystal Blue' visionspictures.com
wood sage 'Crystal Blue' RHS

Other common names

Balkan clary 'Crystal Blue', sage 'Crystal Blue'

Synonyms

Salvia nemorosa 'Crystal Blue' (Color Spires Series)
Salvia 'Crystal Blue'

Plants for pollinators
Herbaceous Perennial
Buy this from Plant Nurseries
8 Suppliers

A clump-forming perennial with a branching habit and rough-textured, softly-hairy, dark green to grey-green leaves on upright stems. Tightly packed clusters of pale blue flowers appear from summer to autumn

Position

Full sun

Soil Types

Chalk, 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 Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–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

Fragrance Foliage
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Lamiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Salvia can be annuals, biennials, herbaceous or evergreen perennials, or shrubs. They have paired, simple or pinnately lobed, often aromatic leaves and 2-lipped flowers in whorls, forming simple or branched spikes or racemes
Name Status
Accepted

How to Grow

Cultivation

Grow in light, moderately fertile, humus-rich, moist but well-drained soil. Best in full sun but can tolerate light partial shade

Propagation

Propagate by division in spring or by softwood cuttings in spring or early summer and semi-ripe cuttings in late summer or autumn

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Patio and container plants
  • Wildlife gardens
  • Mediterranean climate plants
  • Flower borders and beds

Pruning

Remove flower spikes as they fade to prolong flowering

Pests

May be susceptible to slugs, snails and sage leafhopper

Diseases

May be susceptible to honey fungus (rarely), powdery mildews, verticillium wilt and foot and root rots