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Giant rhubarb      

Gunnera manicata

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Belonging to the Gunnera genus, Giant rhubarb has a botanical name of Gunnera manicata.

Large rhubarb like plant with giant leaves on long leaf stalks. Enjoys poor moist soil in a sheltered position, preferably close to water. Can be contained by planting in a big bucket. It has light green flower spikes in early summer and later orange brown seed pods

Blooms appear in these approximate colours:   Android robot green and   Green-yellow and   Kelly green. When mature, they grow to 30.0 cm (11.7 inches imperial) in diameter. Leaves appear approximately as a   Lime green and   Forest green (web)

It is a flowering non-edible ornamental that typically grows as a perennial, which is defined as a plant that matures and completes its lifecycle over the course of three years or more.

Giant rhubarb is known for growing with a clump-forming habit to a height of approximately 2.00 metres (that's 6.50 feet in imperial). This plant tends to bloom in early summer.

Brazil is believed to be where Giant rhubarb originates from.

Due to how easy it is to grow in a variety of conditions, Giant rhubarb is great for beginner gardeners and those that like low maintainance gardens.

This plant info is provided by the myfolia gardener's wiki. All details about Giant rhubarb have been kindly provided by our members.

How to grow Giant rhubarb

  • Dappled Sun

  • Partial Sun

  • High

Plant out in a damp sunny shletered spot, preferably by the edge of water. It can be contained by planting in a large bucket.
The crown of the plant may be protected from winter frosts by bending the old leaves back over to cover the central crown

Try to plant in a location that enjoys dappled sun / partial sun and remember to water often. Keep in mind when planting that Giant rhubarb is thought of as hardy, so this plant will grow or become dormant during the winter.

See our list of companion Plants for Giant rhubarb to see which plants you should plant in close proximity to encourage growth.

Growing Giant rhubarb from seed

Sow fresh seed in late summer, as soon as they are ripe. Germination can be irregular, two weeks to two months. Keep compost moist but not wet using a spray.

Sow at a depth of approx. 0.2 inches (0.5 cm) and aim for a distance of at least 9.75 feet (3.00 metres) between Giant rhubarb plants. Soil temperature should be kept higher than 20°C / 68°F to ensure good germination.

Transplanting Giant rhubarb

Overwinter seedlings in a cold frame. Keep damp.

As Giant rhubarb is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.

How long does Giant rhubarb take to grow?

These estimates for how long Giant rhubarb takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

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Other names for Giant rhubarb

Dinosaur food


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