Corydalis wilsonii

RHS Plant Profile

Wilson's corydalis

RHS

Alpine Rockery

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An evergreen, tap-rooted perennial with ferny, grey-green leaves and loose clusters of tubular, canary-yellow flowers tipped with green, produced in spring

Position

Full shade, Partial shade

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: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full shade Partial shade

Aspect: North–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: Papaveraceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Clump forming
Genus: Corydalis can be annuals, biennials or tuberous or rhizomatous perennials, with ternately or pinnately lobed leaves and racemes of spurred, tubular flowers
Name Status: Correct
Plant Range: C China

How to Grow

Cultivation

Grow in a bulb frame or alpine house in equal parts loam, leaf mould and grit, or in a shady wall. Resents excessive wet

Propagation

Propagate by seed sown in containers in an open frame when ripe or by division in autumn

Suggested planting locations and garden types

Patio and container plants
Rock garden

Pruning

No pruning required

Pests

May be susceptible to aphids and glasshouse red spider mite under glass

Diseases

Generally disease-free