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BulbsHerbaceous Perennial

Chasmanthe floribunda 'Saturnus'

Adam's rib 'Saturnus'

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

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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)

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

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.