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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.
'Woodbridge' is a medium-sized, upright deciduous shrub with dark, lobed leaves. Flowers to 10cm in width, single, deep pink, with dark red centres
'Oiseau Bleu' is a medium-sized, upright deciduous shrub with lobed, dark green leaves. Flowers single, violet-blue with a maroon centre, to 8cm in width, in late summer and autumn
White Chiffon is a vigorous deciduous shrub with dark green, shallowly lobed leaves and pure white flowers to 10cm across from late summer, with five large outer petals surrounding a centre of small, petaloid stamens
'William R. Smith' is a robust deciduous shrub with dark green, three-lobed leaves and single white flowers to 10cm across in late summer and autumn
'Marina' is a bushy, upright shrub to about 2.5m with dark green, lobed leaves. Blue-purple, single flowers with dark red centres, are produced from late summer to mid-autumn
Pink Chiffon is a deciduous shrub, to 2m tall, with lobed, green leaves. Pale pink, semi-double flowers, to 8cm across, with darker veins at their centre are borne from mid-summer to autumn
China Chiffon is a bushy, deciduous shrub to 2m tall, with lobed, dark green leaves and semi-double, white flowers 10cm across, with dark red streaksin the centre, opening from late summer to mid-autumn
'Meehanii' is a large deciduous shrub with ovate to three-lobed leaves margined with creamy-white, and single, mauve flowers with maroon centres from late summer onwards
'Hamabo' is a medium-sized, deciduous shrub with strongly lobed leaves and blush-pink flowers 12cm in width, with a conspicuous red blotch at the base of each petal
'Gandini van Aart' is a very tall, narrow, pillar-like shrub to 5m, with dark green, lobed foliage and pure white, single to semi-double blooms from mid-summer to mid-autumn
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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.