Oxalis oregana

RHS Plant Profile
redwood sorrel

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redwood sorrel RHS
Herbaceous Perennial
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A creeping, rhizomatous perennial with hairy, mid-green, trifoliateleaves. Solitary rose-pink, lilac or white flowers 2.5cm across are produced on slender stems from spring to autumn. Reaches 20cm in height and will spread indefinitely, naturalising in shady, woodland conditions

Position

Full shade, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
2–5 years
Max Spread
wider than 8 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full shade Partial shade
Aspect
North–facing or East–facing or West–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Oxalidaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Matforming
Genus
Oxalis can be annuals or perennials, with fibrous, bulbous or rhizomatous rootstocks, palmately divided leaves and funnel-shaped or bowl-shaped flowers that mostly close in dull weather and at night
Name Status
Correct
Plant Range
Western N America

How to Grow

Cultivation

Grow in moist, fertile, humus-rich soil in full or partial shade

Propagation

Propagate by division in spring; small sections of the rhizomes root readily with bottom heat

Suggested planting locations and garden types

  • Cottage and informal garden
  • Patio and container plants
  • Rock garden
  • Ground cover

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to a rust