About
In mid summer, dense panicles of small greenish-yellow flowers are held on upright stems above the foliage, followed by reddish-green seeds. A large herbaceous perennial which overwinters as a short crown, and in spring produces triangular to heart-shaped dark green leaves up to 50cm long, held on thick, slightly ridged, reddish-green stems. This species may have been involved in the parentage of the hybrids now used as culinary rhubarb.
About the genus
Rheum are robust rhizomatous herbaceous perennials with large, simple or palmately lobed leaves and tall leafy stems bearing large panicles of tiny flowers
Growing conditions
SunlightFull sun, Partial shade
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectEast-facing, South-facing, West-facing
ExposureExposed, Sheltered
UK hardinessH6
Plant details
Plant typeHerbaceous Perennial
HabitBushy
FoliageDeciduous
Height1-1.5 metres
Spread1-1.5 metres
Time to full height2-5 years
Suggested usesArchitectural, Cottage and informal garden
Native toEurope to Siberia, E.Asia
ToxicityHarmful if eaten. Wear gloves and other protective equipment when handling Pets: Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Care notes
CultivationGrow in moist but well drained soil. Mulch with manure in spring; avoid covering the crown. Keep watered in dry summers. See rhubarb cultivation for more detailed advice
PruningDeadhead spent flower spikes unless seed is required, cut back faded leaves at the end of the season
PropagationPropagate by seed or by division
Pest resistanceMay be susceptible to slugs and aphids
Disease resistanceMay be susceptible to crown rot, honey fungus and virus diseases