Crocosmia masoniorum 'Rowallane Yellow'

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giant montbretia 'Rowallane Yellow'

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giant montbretia 'Rowallane Yellow' RHS
giant montbretia 'Rowallane Yellow' RHS
giant montbretia 'Rowallane Yellow' RHS

Synonyms

Crocosmia 'Rowallane Yellow', Crocosmia 'Rowallane', Crocosmia masoniorum 'Rowallane', Crocosmia masoniorum Rowallane yellow

Herbaceous Perennial
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An erect herbaceous perennial to 80cm, with narrowly sword-shaped leaves and sprays of bright chrome yellow flowers in summer

Position

Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

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

Position

Partial shade
Aspect
South–facing or West–facing or East–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
Iridaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Crocosmia are deciduous cormous perennials with erect, sword-shaped leaves and branched spikes of showy, funnel-shaped flowers in summer
Name Status
Accepted

How to Grow

Cultivation

Plant 8 to 10cm deep in moderately fertile, humus-rich soil. Lift and divide congested clumps to maintain vigour. Has the potential to become a nuisance in some gardens if not managed well

Propagation

Propagate by division in early spring as growth begins

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • City and courtyard gardens
  • Banks and slopes
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free