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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.
D. peltata is a rhizomatous herbaceous perennial to 1.5m in height, with glossy, rounded leaves to 45cm in width, turning red in autumn. Clusters of pale pink flowers arise on tall stems before the leaves
R. palmatum is a clump-forming perennial. With large, lobed leaves up to 75cm long and panicles of pink or creamy-white flowers that rise on 2m long stems in early Summer, this ornamental rhubarb is an architectural plant that demands space
'Timperley Early' is a high-yielding first early cultivar. The thick stems are deep red at the base, passing to light green with red flecks; flesh is green
'Reed's Early Superb' is a vigorous maincrop cultivar with long, straight, medium to thick stems which are succulent and tender. Bright red colour grading to dark green. Has exhibition potential
R. alexandrae is a rhizomatous perennial with large, glossy, dark green leaves with heart-shaped bases and prominent veins. In early summer produces drooping sprays up to 60cm long of tiny, star-shaped, yellow-green flowers which are almost covered by hanging, creamy bracts 10cm or more long
'Rhubarb and Custard' is a rounded, bushy, evergreen shrub to about 60cm. The stems are dark purple and the small, oval leaves are grey-green with an irregular cream to yellow margin and flushed with pink, especially in cold weather. Short spikes of small, purple flowers appear in mid- to late summer
'Hawke's Champagne' is a relatively compact early to midseason rhubarb variety producing sweet, bright red, medium length and uniform stems
G. magellanica is a mat-forming perennial with cupped, kidney-shaped, dark green leaves about 7cm across on 10cm stalks. In summer, short flower spikes appear bearing tight clusters of small, greenish flowers followed by orange-red berries
'Atrosanguineum' is a robust herbaceous perennial with broad, palmately lobed leaves that open rich purple, fading to dark green with purplish undersides; flowers bright pink, in large erect panicles
'Grandad's Favourite' produces "first early" growth. Plants are vigorous and high yielding, with thick, fairly sweet stems and good colour. Good leaf to stem ratio; suitable for showing
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