These are striking big-leafed plants if you have the water to sustain them. The large leaves arise directly from stout rhizomes; flowering stalks produce smaller leaves and prominent bracts that are massed in tall, branching, plumy clusters. They make a great show in late spring or early summer. Grows best in deep, organically enriched soil. For the edible plant, see Rhubarb.Rheum palmatum
From China and Tibet. Grows to 6–8 ft. tall and 6 ft. wide. Nearly round, 2–3-ft.-wide leaves are deeply cut into tooth-edged lobes. Red flower plumes to 2 ft. long. In variety ‘Atrosanguineum’, the entire plant is suffused with red. Leaves of R. p. tanguticum are less deeply cut than those of the species and are often tinted purple; flowers may be white, pink, or red.
From Europe, Caucasus, Siberia. Rather gawky, stiff-twigged, erect growth to 4 ft. tall and 3 ft. wide...
Has larger, more deeply colored flowers than the species. Reblooms in late summer.
From China and Tibet. Grows to 6–8 ft. tall and 6 ft. wide. Nearly round, 2–3-ft.-wide lea...