Lewisiopsis tweedyi 'Alba'

RHS Plant Profile

Tweedy's lewisia 'Alba'

RHS 1999

Synonyms

Lewisia tweedyi 'Alba'

Alpine Rockery

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Has a loose rosette of fleshy, spoon-shaped leaves and slender-stalked sprays of funnel-shaped white flowers to 6cm wide in spring and early summer on stems to 25cm long

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: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Loam Sand

Moisture: Well–drained
pH: Acid or Neutral

Position

Full sun Partial shade

Aspect: South–facing or North–facing or West–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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Montiaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Matforming
Genus: A genus of one species of flowering plant, endemic to the rocky regions of western North America and British Columbia, with oval-shaped, leathery, glossy, dark green foliage and coral, apricot, yellow or pink flowers which appear from spring to summer
Name Status: Accepted

How to Grow

Cultivation

Grow in moderately fertile, humus-rich, sharply-drained, neutral to acid soil. Lewisias dislike winter wet. A position in light shade is ideal. Planting in a crevice or wall can provide all of these requirements

Propagation

Propagate by seed in a seedbed as soon as ripe, or divide in early spring

Suggested planting locations and garden types

Gravel garden
Patio and container plants
Rock garden

Pruning

No pruning required

Pests

slugs and snails can problematic

Diseases

Neck rot can affect them in wet conditions