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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.
'Ivan' is a spreading, mound-forming perennial to about 0.5m high and 1m across. The yellow-green leaves are deeply-lobed, and the flowers, borne in pairs all summer, are red-purple with dark veining and a very dark eye
'Prelude' is a clump-forming herbaceous perennial, 45-90cm high, with deciduous, deeply seven-lobed green leaves, and flowers, up to 2cm across, of widely-spaced pale lilac petals with darker violet veins and pink stigmas, in early summer
'Blue Cloud' is quite a large cultivar, to 90cm high, spreading to 170cm. The green leaves are very finely dissected and it flowers from late spring into summer. The flowers are pale blue with fine, darker, purple, veins, to 4cm across, borne on yellowish stems, the narrow petals giving a wide-awake appearance
'Philippe Vapelle' is a clump-forming perennial. Plants make neat mounds to 40cm, with attractive blue-grey, lobed basal leaves which have a softly hairy, finely wrinkled texture like G. renardii, one of the parents of this cultivar. Flowers have wide-open habit with notched petals; bluish violet with strongly marked dark veins
'Khan' is a clump-forming, herbaceous perennial, 40cm high, with deciduous, deeply lobed, dark green leaves, and upwards-facing, bright purplish-pink flowers, about 8cm across, with darker purple veins, in a very long flowering period from early summer until autumn frosts
'Salome' is a clump-forming perennial. Plants make mounds, 25-30cm tall, of rather deeply dissected leaves, gold-tinged when young, then slightly marbled green. Flowering stems are to 55cm, and will scramble through surrounding plants. Flowers are to 3m wide, dusky violet-pink with very dark veining and central eye zone. Long flowering season
'Sirak' is a spreading perennial to around 40cm, with deeply lobed leaves and light purple flowers with darker veins and a white eye produced from late spring to mid-summer
'Kashmir Pink' is a deciduous perennial with finely-divided, mid-green leaves and bowl-shaped, pale pink flowers with darker veins, produced all summer
'Melinda' is a loosely clump-forming perennial forming mounds of lobed foliage to around 50cm tall. In summer, branching stems bear cup-shaped, pale pink flowers with darker veining, 2-3cm in diameter
'Red Admiral' is a compact herbaceous perennial, to about 60cm, forming a mound of deeply cut, mid-green foliage that turns red in autumn. The flowers are a bright red-purple with fine black veins and a black centre, produced all summer
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