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Annual BiennialHerbaceous Perennial

Alcea rosea 'Halo White' (Halo Series)
  • RHS Plants for pollinators

hollyhock 'Halo White'

'Halo White' is a perennial to 2m tall with lobed green leaves, and in summer, large, single, white flowers with a yellow centre

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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer White Yellow Green
Autumn Green
Winter
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Exposed or Sheltered
Hardiness
H5
Botanical details
Family
Malvaceae
Native to the UK
No
Foliage
Deciduous
Habit
Columnar upright
Genus

Alcea are robust biennials or short-lived perennials with showy funnel-shaped flowers borne in tall, erect racemes in summer

Name status

Unresolved

How to grow

Cultivation

Thrives in well-drained, moderately fertile soil in full sun. May need support on exposed sites, see staking: perennials

Propagation

Propagate by seed sown in gentle heat in mid-winter or in-situ in spring

Suggested planting locations and garden types
  • Coastal
  • Cottage and informal garden
  • Flower borders and beds
  • Wall side borders
Pruning

Cut back dead foliage after flowering, or pull out and discard - growing as annuals or biennials can help limit the spread of rust

Pests

May be susceptible to cutworms and slugs on young growth, and to capsid bugs, aphids and mallow flea beetles

Diseases

May be susceptible to hollyhock rust

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