Primula reidii var. williamsii (So)

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<em>Primula</em> <em>reidii</em> var. <em>williamsii</em> (So) RHS
<em>Primula</em> <em>reidii</em> var. <em>williamsii</em> (So) RHS
Alpine Rockery Herbaceous Perennial
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A robust, rosette-forming, deciduous perennial with scalloped or lobed leaves up to 20cm long. In summer produces compact clusters of hanging, bell-shaped, pale blue and white, fragrant flowers on 15cm stems

Position

Full shade, Partial shade

Soil Types

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

Loam Sand
Moisture
Moist but well–drained
pH
Acid

Position

Full shade Partial shade
Aspect
North–facing or East–facing
Exposure
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 Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Primulaceae
Native to GB/Ireland
No
Foliage
Deciduous
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
Correct
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

Soldanelloides primulas form creeping mats of green, deeply pinnate, oval-shaped leaves, with solitary, nodding, funnel-shaped white flowers

How to Grow

Cultivation

Grow in deep or partial shade in naturally peaty, gritty, moist but very well-drained soil, protected from excessive winter wet, or grow in an alpine house or cold frame in a mix of equal parts peat-free, loam-based potting compost, leaf mould, peat substitute and grit

Propagation

Propagate by division in spring or by seed sown from autumn to spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Rock garden
  • Flower borders and beds

Pruning

Cut back after flowering

Pests

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

Diseases

May be susceptible to, grey moulds and primula leaf spot