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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.
'Charity' is an upright evergreen shrub to 4m tall, with pinnate leaves composed of up to 21 lance-shaped leaflets, and small, cup-shaped yellow flowers borne in erect, clustered terminal racemes to 35cm long in late autumn and winter
'Arthur Menzies' is an upright, evergreen shrub to 3m tall with leaves up to 45cm long comprising up to 19 spiny, blue-green leaflets. Upright racemes of lemon-yellow flowers begin to spread as the small flowers start to open and may be followed by clusters of blue-purple berries
'Lionel Fortescue' is a large, erect evergreen shrub with spiny, pinnate leaves to 45cm in length. Flowers bright yellow, scented, in clustered upright racemes to 40cm in length. Berries blue-black
'Cantab' is a stoutly branched, evergreen shrub with large, arching, spiny leaves up to 60cm long, with up to 15 leaflets, some of which turn red in winter. The pale lemon, scented flowers are produced in lax sprays in late autumn and early winter
x M. aquisargentii is an upright evergreen shrub with a mixture of simple, thin leaves and more leathery, 3-parted leaves; small clusters of yellow flowers open in early summer sometimes followed by black berries
Mahonia x media is a large, evergreen, strongly upright shrub with leaves up to 45cm long composed of 17 to 21 tough, spiny leaflets. The small, cup-shaped, slightly-scented, yellow flowers are carried at the ends of the branches in clusters of long sprays, at first upright then spreading, and followed by juicy, oval, black berries
'Underway' is a medium-sized evergreen shrub to 3m, of bushy, upright habit, with spiny pinnate leaves and small, fragrant bright yellow flowers in erect, clustered racemes, followed by blue-black berries
'Undulata' is an erect evergreen shrub with pinnate leaves composed of spiny-edged, glossy leaves turning purple in winter, and bright yellow flowers in short, clustered racemes in spring
M. oiwakensis subsp. lomariifolia is an erect large evergreen shrub to 3m, with long, pinnate leaves with spiny leaflets. Flowers bright yellow, slightly scented, in dense, erect, clustered racemes to 25cm in length from late autumn into winter, followed by blue-black berries
M. japonica is an erect medium-sized evergreen shrub with large, spined, leathery pinnate leaves and small, fragrant light yellow flowers in spreading or drooping sprays from late autumn to early spring, followed by blue-black berries
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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.