Primula 'Crescendo Blue Shades' (Crescendo Series) (Pr/Poly)

RHS Plant Profile
polyanthus 'Crescendo Blue Shades'

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polyanthus 'Crescendo Blue Shades' RHS 1997
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Annual Biennial Bedding Herbaceous Perennial

A short-lived perennial to 25cm, usually grown as an annual, forming a rosette of oblong leaves, with erect stems bearing an umbel of large blue flowers with conspicuous yellow eyes

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
South–facing or East–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Primulaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Clump forming
Genus
Primula are herbaceous or semi-evergreen perennials, forming a basal rosette of simple leaves, with salver-shaped or bell-shaped flowers which may be solitary or carried in an umbel or in whorls on an erect stem
Name Status
Accepted
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea

Polyanthus group primulas are rosette-forming perennials with umbels of salver-shaped flowers. They are usually grown as biennials by sowing seed in summer and planting out in autumn for flowers in winter and spring.

How to Grow

Cultivation

Grow in fertile, humus-rich, moist but well-drained soil in full sun or partial shade, do not allow to dry out in hot weather. See Primroses and polyanthus cultivation

Propagation

Propagate by seed sown in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • City and courtyard gardens
  • Patio and container plants
  • Flower borders and beds
  • Underplanting of roses and shrubs
  • Garden edging

Pruning

Cut back after flowering

Pests

May be susceptible to aphids, glasshouse red spider mite, leafhoppers, vine weevil and slugs

Diseases

May be susceptible to grey moulds, primula brown core and a virus