Begonia koelzii

RHS Plant Profile
Koelz's begonia

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Herbaceous Perennial Conservatory Greenhouse
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A rhizomatous perennial, with spotted stems and large, palmately lobed green leaves up to 40cm long. Clusters of pink flowers are produced in late summer and autumn

Position

Full shade, Partial shade

Soil Types

Loam

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

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

Growing Conditions

Loam
Moisture
Moist but well–drained
pH
Acid or Neutral

Position

Full shade Partial shade
Aspect
East–facing or North–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)
H2

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Begoniaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Begonia can be annuals, evergreen or deciduous perennials or shrubs, with fibrous, tuberous or rhizomatous roots and usually asymmetrical leaves, often strikingly patterned, and small or large flowers, both male and female in the same cluster
Name Status
Unresolved

How to Grow

Cultivation

Thrives in fertile, moist soil, in dappled or afternoon shade. Provide winter protection in mild areas; elsewhere best grown in a greenhouse or conservatory, or in containers that can be moved indoors over winter. See begonias: outdoors for further information

Propagation

Propagate by basal softwood cuttings in spring, or by seed; plants may self-seed in place, dropping tiny bulblets from the base of the leaves in autumn

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to caterpillars, mealybugs, mites, thrips, vine weevil and aphids

Diseases

May be susceptible to grey moulds (botrytis), powdery mildews and stem rot