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Giant Rhubarb in the GardenTags plant encyclopedia

Gunnera manicata

 

Giant Rhubarb

Gunnera magellanica is a mat-forming perennial with kidney-shaped leaves. Short flower spikes appear in Summer with tight clusters of small, greenish flowers. The flowers are followed by orangey-red berries

 
plant Features
  • Giant Rhubarb likes full sun to partial shade

    Full sun to partial shade

  • Giant Rhubarb likes frequent watering

    Frequent watering

  • Giant Rhubarb is frost hardy: 23f (-5°c)

    Frost Hardy: 23F (-5°C)

  • Giant Rhubarb likes moist and fertile

    Moist and fertile

 
Available to buy from 2 store(s) in the UK
 
plant information

Common name

Giant Rhubarb

Latin name

Gunnera manicata

type

Herbaceous Perennials

family

Gunneraceae

ph

5.0 - 8.5 Acid - Neutral

  • Light

    Giant Rhubarb likes full sun to partial shade

    Full sun to partial shade

  • Frost

    Giant Rhubarb is frost hardy: 23f (-5°c)

    Frost Hardy: 23F (-5°C)

  • Soil

    Giant Rhubarb likes moist and fertile

    Moist and fertile

  • Water

    Giant Rhubarb likes frequent watering

    Frequent watering

Plant & bloom calendar

  •  
    Best time to plant
  •  
    When the plant will bloom

full grown dimensions

The size of a fully grown Giant Rhubarb is 2.00meters x 1.50meters 2.00 M 1.50 M

Gunnera manicata

Gunnera magellanica is a mat-forming perennial with kidney-shaped leaves. Short flower spikes appear in Summer with tight clusters of small, greenish flowers. The flowers are followed by orangey-red berries


Flowering Season

From Mid Spring TO Late Autumn

Flower spikes start to appear from spring. They can grow to 15 inches but are generally hidden from view by the giant leaves. Cut back in late autumn.

 

Planting Outdoors

From Late Winter TO Early Spring

Plant out container grown plants in moisture retentive site.

 

Propagation by division.

From Mid Spring TO Early Summer

Once established, the gunnera crown should not be disturbed however, small crowns which appear around the sides and base of old plants can be carefully removed in spring and planted in pots of compost number 2 and keep shaded until growth is well established.

 
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