Corylus colurna
A conical tree with oval dark green leaves, turning yellow in autumn. Bears yellow catkins late winter. Produces edible hazelnuts in deeply fringed husks in autumn.
Corylus avellana ‘Cosford Cob’
An upright tree-like shrub with heart-shaped mid-green leaves. Bears yellow catkins late winter early spring. Produces edible thin shelled hazelnuts ripening in autumn.
Corylus avellana ‘Contorta’
A shrub with heart-shaped green leaves and strongly twisted stems, that are particularly effective in winter. Bears yellow catkins late winter early spring.
Corylus avellana ‘Aurea’
An upright tree-like shrub with heart-shaped bright yellow young leaves, becoming yellow-green when mature. Bears yellow catkins late winter early spring.
Corylus avellana (cobnut)
An upright tree-like shrub with heart-shaped green leaves. Bears yellow catkins late winter early spring. Produces edible hazelnuts.
Corylopsis spicata
An open spreading shrub with dark green leaves above and blue-green beneath. Pendent racemes of bell-shaped, bright yellow flowers, with red to purple anthers.
Corylopsis sinensis var. sinensis ‘Spring Purple’
An open spreading shrub with dark plum purple leaves when young. Pendent racemes of bell-shaped, pale lemon yellow flowers.
Corylopsis sinensis var. sinensis
A large shrub or small tree with lemon-yellow flowers.
Corylopsis pauciflora
A bushy, spreading shrub with bright green leaves, bronze when young. Pendent bell-shaped , fragrant, pale yellow flowers.
Corydalis wilsonii
An evergreen perennial with blue-green divided leaves and racemes of short spurred, green tipped, canary yellow flowers.
Corydalis solida f. transsylvanica ‘George Baker’
A perennial with grey-green, deeply divided leaves and racemes of deep reddish salmon pink flowers with downward curving spurs.
Corydalis solida
A perennial with grey-green, deeply divided leaves and racemes of pink to purple-red or white flowers with downward curving spurs.