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A picture of a Giant Rhubarb

Giant Rhubarb

Gunnera manicata

Also known as

Chilean Rhubarb, Prickly Rhubarb

Gunnera manicata (5) by Dezidor (CC BY 2.5)

Full Sun
Moderate care
Frequent watering
Frost Hardy

8a

USDA zone

-12°C

Minimum temperature

Expected size

Height
Spread

2.5m

Max

4m

1.5m

Min

2.5m

Flowering

  • spring
  • summer
  • autumn
  • winter

More images of Giant Rhubarb

Gunnera manicata3
A photo of Giant Rhubarb
A photo of Giant Rhubarb
A photo of Giant Rhubarb
A photo of Giant Rhubarb

Giant Rhubarb Overview

Gunnera manicata is a very large herbaceous perennial in the Gunneraceae family, grown for its stunning ornamental properties. Common names include Giant Rhubarb, Chilean Rhubarb and Prickly Rhubarb. Its foliage is dramatic - huge, rounded, lobed, sharply toothed, roughly textured leaves that grow up to 2m wide! They are borne on conical spiny stems and the flowers - masses of tiny reddish-green blooms on erect spikes - are usually formed at a height of around 1m in summer. They are red-brown in colour and are followed by spherical red-green fruit. Gunnera manicata has a clumping habit and is hardy to -15C. Although a robust plant, it prefers a sheltered position, is happy in full sun to partial shade and needs a moist, poorly draining soil for optimal growth. Suitable for larger gardens, Gunnera manicata provides architectural interest alongside streams, ponds, lakes or in bog gardens, where it is likely to spread if left unchecked.

Common problems with Giant Rhubarb

Generally pest and disease free.

    How to propagate Giant Rhubarb

    Seed

    Sow seed as soon as it is ripe as it loses viability quickly. Needs gentle heat.

    Cuttings

    Cuttings of leafy, basal buds in spring in spring.

    Special features of Giant Rhubarb

    Attractive leaves

    Wet sites

    Other uses of Giant Rhubarb

    Ornamental, waterside, bog.