Primula × kewensis (Sp)

Conservatory Greenhouse

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An evergreen perennial to 45cm tall, with a rosette of broadly spoon-shaped leaves and erect stems bearing several whorls of fragrant, bright yellow flowers 2cm across in early spring

Position

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 Alkaline or Neutral

Position

Partial shade

Aspect: North–facing or West–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): H3

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Primulaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
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: Floribundae section primulas are perennials forming a rosette of evergreen leaves, with salver-shaped flowers brone in several whorls on the stem

How to Grow

Cultivation

Grow in a cool or temperate greenhouse or as a houseplant. Plant in a well-drained, peat-free, loam-based compost with the addition of extra grit and provide bright, filtered light.

Propagation

Divide between autumn and early spring. Take root cuttings when dormant in the winter. Root basal cuttings or offshoots in autumn or early spring

Suggested planting locations and garden types

Patio and container plants

Pruning

cut back old flowering stems as they finish.

Pests

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

Diseases

Susceptible to primula brown core, powdery mildew and a virus