About
Gunnera manicata, giant rhubarb, is one of the most spectacular of all herbaceous plants, forming a spreading clump of enormous, lobed, rough-textured leaves on spiny stems 1�2 m across. Tiny, red-brown flowers are borne in erect panicles to 1 m tall. A garden statement plant for a large, moist, sheltered site. Note: plants sold as G. manicata may actually be the hybrid G. _cryptica; strictly invasive-species rules apply to G. tinctoria and G. _cryptica in the UK.
About the genus
Gunnera are rhizomatous perennials ranging from tiny, creeping species to the enormous giant rhubarb (G. manicata), with lobed or rounded leaves and small flowers in narrow spikes or panicles. Grown for their striking foliage in moist, sheltered garden positions.
Plant details
Suggested usesHerbaceous borders, cottage gardens, cutting.
Native toBrazil
Care notes
CultivationAlthough there are many plants sold under this name, it is highly likely that they are actually the hybrid Gunnera × cryptica. Gunnera tinctoria / G. × cryptica are considered invasive and should not be cultivated. Strict rules apply in the UK for Gunnera tinctoria and G. × cryptica – it is an offence to plant or cause these to grow in the wild. They are banned from sale and gardeners already growing these plants should undertake measures to prevent spread beyond their garden and ensure correct disposal of plants. Existing plants in gardens do not have to be removed, but any excess material should be disposed of either by burning on site or taking to a waste processing centre. These rules do not apply to G. insignis and G. killipiana, but these are not hardy in most gardens. See invasive non-native species for further advice
PruningMinimal pruning required. Remove dead or damaged growth as needed.
PropagationPlease see cultivation notes
Pest resistanceGenerally trouble-free. Monitor for slugs and aphids.
Disease resistanceGenerally disease-resistant. Ensure good air circulation.