× Alcalthaea suffrutescens 'Parkallee' (d)

RHS Plant Profile

shrubby alcalthaea 'Parkallee'

Synonyms

Alcea × kitaibela 'Parkallee', Alcea × _Althaea_, 'Parkallee', Althaea 'Parkallee', Malva 'Park Allee'

Herbaceous Perennial

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A tall, bushy perennial to 2.5m with lobed, softly hairy, grey-green leaves. Tall spires of apricot-cream, semi-double, hollyhock-like flowers are produced from mid-summer to early autumn

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 1-1.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–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): H4

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: × Alcalthaea are bigeneric hybrids between Alcea and Althaea. They are tall, branching, short-lived perennials with hairy foliage and spires of pink, cream or yellow flowers
Name Status: Accepted

How to Grow

Cultivation

Best in fertile, well-drained soil in a sunny, sheltered position. May need staking

Propagation

Propagate by softwood cuttings, does not produce seed

Suggested planting locations and garden types

Cottage and informal garden
Wall side borders
Flower borders and beds

Pruning

Cut down to ground once flowering is over

Pests

May be susceptible to mallow flea beetles or aphids

Diseases

May be susceptible to a rust