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All ratings refer to the UK growing conditions unless otherwise stated. Minimum
temperature ranges (in degrees C) are shown in brackets
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.
'Prins Claus' is a spring-flowering cultivar with white flowers, marked boldly in dark purple on the outer face of petals, particularly of the outer 3 petals
'Zwanenburg Bronze' is a perennial corm flowering with the leaves. Flowers fragrant, rich deep yellow, heavily marked outside with dark bronze
'Ard Schenk' bears large, white flowers in mid spring with a bright yellow base internally and a prominent orange-yellow stigma
C. corsicus is a perennial corm flowering as the leaves develop. Fragrant flowers with tepals to 3.5cm in length are lilac within, creamy outside with deep purple stripes
'Leichtlinii' is a perennial to 10cm in height, with narrow greyish-green leaves and slender stems bearing solitary, erect, light blue funnel-shaped flowers 3-4cm in width, with a prominent white throat
'Albus' is a perennial corm with leaves and flowers developing together in late autumn and early winter, the flowers pure white, with prominent red stigma lobes
'Bowles's White' is a cormous perennial that produces its narrow leaves at the same time as the fragrant, yellow-throated, pure white flowers appear, in late winter and early spring
C. serotinus subsp. salzmannii is an autumn-flowering corm. Funnel-shaped, lilac blue flowers, to 10cm in height, sometimes with a yellow throat, appear with the narrow, linear leaves
C. laevigatus is a corm with fragrant, light lilac-purple or white flowers striped purple on the outside, and with a yellow throat, opening from late autumn
C. ochroleucus is a cormous perennial flowering with or before the leaves. Flowers white, with a yellow throat
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