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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.
'Palm Springs' is a dwarf, bulbous plant, to 12cm in height, with erect, linear, mid-green leaves. The early spring flowers are royal-blue with a darker blue throat, speckled white and a bright yellow central band on the falls
'Frank Elder' is a compact, bulbous perennial to 10cm tall with erect, lance-shaped leaves. Pale blue flowers with a pale yellow flush, blue spots and veins on the falls and a yellow crest are borne in spring
I. danfordiae is a small, bulbous perennial growing to 10cm tall. In early spring, a single, yellow, scented flower is borne with tiny brown or green speckles on each fall. Narrow, four-sided leaves are short at flowering but then elongate reaching up to 30cm long
'Cantab' is a dwarf bulb, up to 15cm high, with slender leaves and flowers in late winter and early spring. The standards are a soft, pale blue and the falls deeper blue with white stripes around a yellow-orange blotch
'Sea Breeze' is bulbous perennial, to around 10cm in height, with green, erect, strap-like foliage and pale blue and cream flowers in early spring; the falls are cream with pale-blue speckling, a yellow throat and dark-yellow central band
'Pixie' produces dark violet-blue flowers with white and yellow markings
'George' is a dwarf, bulbous iris to 12cm in height in flower, with linear leaves and fragrant, deep violet-purple flowers 8cm across, marked with yellow in the falls, in early spring
'Natascha' is a dwarf, bulbous plant to 12cm, with upright, linear, mid-green leaves. The early-spring flowers are very pale grey-blue, with some darker markings and a bright yellow central band on the falls
'Blue Hill' is a bulbous perennial, to 12cm in height, with erect, green, strap-like leaves and violet-blue flowers in spring; the falls have a white speckled throat and a yellow central band
'Harmony' is a dwarf, bulbous plant, to 12cm in height, with erect, linear, mid-green leaves. The early spring flowers are royal-blue with a striped white throat and bright yellow central band on the falls. The crests have a slightly feathered edge, creating a softly-ruffled effect
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.