Chasmanthe floribunda 'Saturnus'

RHS Plant Profile
Adam's rib 'Saturnus'

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A clump-forming perennial with bright-green upright lance-shaped leaves. The stems of the flower spikes are dark purple, holding upright orangey red tubular flowers with yellow throats during the summer months

Position

Full sun, Partial shade

Soil Types

Chalk, 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 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
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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Iridaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Genus
A genus of flowering clump-forming perennials from iris family, endemic to Cape Provinces in South Africa. The plants grow from corms, producing a clump of narrow, lance-shaped leaves. Upright flowering stems carry tubular flowers arranged neatly in two vertical rows
Name Status
Accepted

How to Grow

Cultivation

In milder parts of the UK grow in a sunny or semi shade spot, in rich moist but well drained soil. They can over winter outside in very sheltered gardens with free draining soil. But are best lifted or grown in pots for frost prone gardens

Propagation

Propagate from seed in spring or divide established clumps in spring, discarding old or damaged corms

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Mediterranean climate plants
  • Patio and container plants
  • Gravel garden
  • Flower borders and beds
  • Wall side borders

Pruning

Cut back in late winter before the new growth appears

Pests

Generally pest-free

Diseases

Generally disease-free