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As its name suggests this is an especially vigorous and free-flowering variety with masses of sweetly scented tubular flowers from April to August opening pure white and ageing to yellow. The handsome dark green leaves are retained all year and in hot summers the flowers may be followed by small purple-black berries. It looks lovely scrambling over an old boundary wall or growing through a robust mature tree.

• Garden care: Cut back established plants after flowering removing a third of the flowering shoots. Apply a generous 5-7cm (2-3in) mulch of well-rotted compost or manure around the base of the plant in early spring.