[3] The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit: It is a woody evergreen climbing shrub, which can grow in a range of conditions.

It prefers well-drained or alkaline soils rich in nutrients and humus with good water provision, but is extremely tough and adaptable.

Like many climbing plants, it prefers its roots in cool shade with its crown in full sun.

It can live over 400 years, reaching heights of 30m where suitable surfaces (trees, cliffs, walls) are available.

It climbs by means of aerial rootlets with matted pads that cling strongly to the substrate.