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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names white-spathed jack in the pulpit
Family Araceae
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
Details A. candidissimum is a tuberous perennial to 30cm in height, with leaves composed of three ovate leaflets, appearing after the flowers. White, hooded spathes, striped pale pink, with a greenish tube are 10cm in length and appear in summer
Plant range W China
Foliage Deciduous
Habit Columnar/Upright
Toxicity Ingestion may cause severe discomfort, skin and eye irritant. Wear gloves and other protective equipment when handling
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H4
Full Sun
Partial Shade
Aspect South-facing or North-facing or West-facing or East-facing
Exposure Sheltered
Chalk
Loam
Sand
MoistureMoist but well-drained
SoilChalk, Loam, Sand
pHAcid, Neutral
Ultimate height 0.1-0.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 5-10 years
Cultivation Grow in moist but well-drained humus-rich soil in a cool site. In colder regions may need winter protection and tubers must not dry out when dormant
Propagation Propagate by seed, sowing them in containers in a cold frame in autumn or spring. Offsets may be removed in late summer
Suggested planting locations and garden types Flower borders and beds Underplanting of Roses and Shrubs Cottage & Informal Garden
Pruning No pruning required
Pests Susceptible to slugs and vine weevil
Diseases Generally disease free
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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.