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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.
'Firebird' is a clump-forming, evergreen perennial to 2m tall with upright or slightly drooping sword-like leaves rangeing in colour from bronze-green through purple-green to bronze-orange with bright red stripes and margins. In summer, erect stems bearing panicles of tubular red flowers may appear
P. tenax Purpureum Group is a robust evergreen perennial with dull coppery-purple, strap-shaped leaves to 2m in length. Flowers reddish, in large panicles to 3m or taller
'Cream Delight' is an evergreen perennial making a compact clump of arching, sword-shaped leaves which are mostly cream, narrowly edged with green; tubular greenish-yellow flowers are seldom produced
'Variegatum' is a clump-forming evergreen perennial with erect, strap-shaped leaves to 1.8m in length, green striped with cream towards the margins. Flowers dull red, in large panicles
'Yellow Wave' is an evergreen, clump-forming perennial with arching, strap-shaped leaves to 1m in length, heavily striped with bright yellow. Flowers seldom produced
'Sundowner' is an evergreen perennial forming a clump of erect leaves to 1m or more, bronze-green striped towards the margins with red and pink. Flowers yellowish, seldom produced
'Duet' is an evergreen perennial up to 80cm in height, with sword-shaped leaves green in the centre, variegated with cream along the margins. Flowers yellowish, seldom produced
'Tricolor' is an evergreen perennial making a large clump of sword-shaped leaves striped with yellow and green, edged with red. Flowers yellowish-green, in large panicles appear on mature plants in summer
P. tenax is a robust evergreen perennial making a medium-sized clump of dark grey-green, strap-shaped leaves. Tubular, dull red flowers about 4cm in length, in a panicle to 4m in height
'Maori Queen' (v) is an evergreen, clump-forming perennial to 90cm tall. Upright bronze-green, strap-shaped leaves, drooping at the tips have rose-red stripes. Panicles of tubular yellowish flowers are borne in summer.
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