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Arisaema sikokianum

Japanese cobra lily

A tuberous perennial, to about 40cm, with dark green, divided leaves. The flowers appear in spring and consist of a large, dark purple spathe, up to 20cm long, with a brilliant white interior housing the club-like spadix. A dense cone of red berries follows

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Ultimate height

0.1–0.5 metres

Time to ultimate height

5–10 years

Ultimate spread

0.1–0.5 metres

Loam

Sand

Moisture

Moist but well–drained

pH

Acid, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

East–facing or North–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: Araceae
Native to the UK: No
Foliage: Deciduous
Habit: Columnar upright
Potentially harmful: Humans/Pets: Harmful if eaten, skin/eye irritant. Wear gloves and other protective equipment when handling For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Arisaema are mostly tuberous perennials usually with palmately lobed leaves, and distinctive tubular, hooded spathes within which the tiny true flowers are clustered at the base of the club-like or filamentous spadix, followed by a spike of red berries
Name status: Correct
Plant range: Japan

How to grow

Cultivation

Grow in moist but well-drained, humus-rich soil in a cool site. In colder regions may need winter protection but tubers must not dry out when dormant

Propagation

Propagate by seed sown in containers in a cold frame in autumn or spring. Offsets may be removed in late summer

Suggested planting locations and garden types

Cottage and informal garden
Flower borders and beds
Underplanting of roses and shrubs

Pruning

No pruning required

Pests

May be susceptible to slugs and vine weevil

Diseases

Generally disease-free

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