Sidalcea 'Oberon'

RHS Plant Profile

prairie mallow 'Oberon'

RHS / Joanna Kossak

Herbaceous Perennial

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A deciduous perennial forming a basal rosette of glossy green, rounded leaves. Branching stems with lobed leaves bear upright flower spikes to 70cm tall in summer; the open, cup-shaped flowers are a soft rose-pink with whitish centres

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: West–facing or South–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

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Malvaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy
Genus: Sidalcea can be annuals or perennials, forming a clump of rounded or palmately lobed basal leaves, with erect stems bearing more deeply divided leaves and terminal racemes of 5-petalled mallow-like flowers
Name Status: Accepted

How to Grow

Cultivation

Best grown in full sun and moist but well-drained soil that is not wet in winter. Plants can be short-lived in heavy soils

Propagation

Propagate by division in spring

Suggested planting locations and garden types

Coastal
City and courtyard gardens
Cottage and informal garden
Patio and container plants
Garden edging
Flower borders and beds
Underplanting of roses and shrubs

Pruning

Cut back after flowering to encourage fresh foliage and promote a long flowering season

Pests

Generally trouble free but young growth may be damaged by slugs and snails

Diseases

May be susceptible to rust diseases