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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.
C. colurna is a medium-sized deciduous tree of symmetrical, conical habit, with slightly lobed broadly-ovate leaves. Pendulous yellow catkins to 8cm in length. Nuts held within a deeply fringed husk
?Red Filbert? is a small tree or large shrub with notable burgundy to purple spring foliage becoming dark green as the season progresses. In late winter it bears purplish-pink catkins that are followed by edible red nuts in the autumn
C. avellana is a large, spreading deciduous shrub or small tree, with rounded leaves turning yellow in autumn, and yellow male catkins in early spring, followed by edible nuts in autumn
'Red Majestic is a compact, spreading to semi-weeping small tree with dark purple leaves, becoming green flushed as the season progresses and twisted branches. In late winter it bears purplish-pink catkins
'Purpurea' is a large deciduous shrub to 6m, with broad, deep purple leaves to 12cm in length. Pendulous pale yellow catkins on leafless twigs in late winter are followed by edible nuts concealed by a tubular husk
'Kentish Cob' is a large deciduous shrub with broad green leaves. Pendulous, pale yellow catkins are followed by an edible nut. This is a reliable filbert with a good flavour; growing at least 2 cultivars ensures cross pollination
'Te Terra Red' has leaves that are red in spring, turning purple and green until leaf fall. Mature trees may reach 6m in 20 years and have a pleasingly-textured bark. Red catkins are borne in late winter. The clusters of nuts in the autumn are also red-tinged and held in spiky, ornamental cases
'Contorta' is a large deciduous shrub with highly contorted and twisted branches bearing broadly ovate leaves and pendent yellow male catkins in late winter and early spring; useful for winter flower arrangements
'Cosford' is a good cobnut for fruit and a good pollinator. Growing at least two cultivars will ensure cross pollination
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