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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.
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Other common names giant rhubarb Chilean rhubarb
prickly rhubarb
Family Gunneraceae
Genus Gunnera may be evergreen or herbaceous rhizomatous perennials, and range from small creeping plants to very large with huge leaves. The flowers are small, borne in narrow panicles or spikes and may be followed by small berry-like fruits
Details G. manicata is a very robust herbaceous perennial, forming a spreading clump of lobed, rounded, rough-textured leaves with spiny stems 1-2m in width. Tiny red-brown flowers are borne in erect panicles to 1m in height
Plant range Brazil
Foliage Deciduous
Habit Clump-forming
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Sun
Partial Shade
Aspect South-facing or East-facing or West-facing
Exposure Sheltered
Clay
Loam
MoisturePoorly-drained
SoilClay, Loam
pHAcid, Alkaline, Neutral
Ultimate height 1.5-2.5 metres
Ultimate spread 2.5-4 metres
Time to ultimate height 5-10 years
Cultivation Grow in permanently moist, humus-rich soil in full sun or partial shade. Shelter from cold drying winds. Protect crowns by mulching during the winter months. This plant is listed on Schedule 3 of the EU (Birds and Natural Habitats) Regulations 2011 in the Republic of Ireland as an invasive non-native species. While this does not prevent it from being sold or from being grown in gardens in the Republic of Ireland, the RHS encourages those that do grow it to take great care with managing it and with disposing of unwanted material. The RHS also encourages gardeners in the Republic of Ireland to find alternative plants to grow to those listed on Schedule 3
Propagation Propagate by seed sown in gentle heat as soon as ripe, seed quickly loses viability. Propagate by cuttings of leafy, basal buds in spring
Suggested planting locations and garden types Architectural Cottage & Informal Garden City & Courtyard Gardens
Pruning Cut back after flowering
Pests Generally pest free
Diseases Generally disease free
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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.