Viola × williamsiana 'Floral Power'

RHS Plant Profile
viola 'Floral Power'

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viola 'Floral Power' RHS
Annual Biennial Bedding

A compact, bushy, free-flowering perennial to 15cm in a wide range of colours including blue, orange, purple, red, white and yellow with some bicolours and some with whiskered 'faces'. Can be grown to flower for several months between February and November, depending on sowing date

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or 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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Violaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Bushy
Genus
Viola can be annuals, biennials or deciduous or evergreen perennials, with simple or pinnately lobed leaves and 5-petalled flowers of characteristic shape
Name Status
Unresolved

How to Grow

Cultivation

Grow in fertile, humus-rich, moist but well-drained soil in full sun or partial shade

Propagation

Propagate by seed sown

Suggested planting locations and garden types

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

Pruning

Deadhead regularly and cut back after flowering

Pests

May be susceptible to slugs, snails, aphids, glasshouse red spider mite, violet gall midge

Diseases

May be susceptible to powdery mildews, pansy leaf spot, a virus and a rust