Hibiscus syriacus 'Monstrosus'

Shrubs

This late flowering hibiscus has large single white flowers with a dramatic contrasting red sunburst at the base of each petal. It’s fairly late flowering, normally from August until October, so a great option for a dramatic display in Autumn

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

2.5-4 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
5–10 years
Max Spread
1.5-2.5 metres
Max Height
2.5-4 metres

Growing Conditions

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

Position

Full sun
Aspect
West–facing or South–facing or East–facing
Exposure
Sheltered
Hardiness
H5

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
Hibiscus can be deciduous or evergreen shrubs, trees, annuals or perennials, with simple or palmately lobed leaves and large, funnel-shaped flowers over a long flowering season
Name Status
Accepted

How to Grow

Cultivation

May be grown outdoors in mild, frost-free areas, or in large containers that can be moved indoors over winter. Outdoors, grow in neutral to slightly acidic soil in full sun, and mulch well over winter. Hibiscus need long, hot summers to flower well. Indoors, grow in bright filtered light with moderate humidity and good ventilation

Propagation

Propagate by softwood cuttings in late spring, by semi-ripe cuttings in summer, or by layering in spring or autumn

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Coastal
  • Flower borders and beds
  • Wall side borders

Pruning

Very little pruning required, especially in the first three years. After three years prune annually after flowering to maintain its shape and to help ensure the outer branches don't fall outwards - pruning group 1

Pests

May be susceptible to aphids, scale insects, mealybugs and glasshouse whitefly when grown under glass

Diseases

May be susceptible to honey fungus (rarely) and powdery mildews