Growing Gunnera (Giant Rhubarb): Dramatic Foliage for Moist Sites

Growing Gunnera (Giant Rhubarb)

Pronunciation: guh-neer'-uh

Gunnera is among the largest perennials on earth, grown for its massive, architectural leaves that can span 6–8 feet. Hardy to zone 7, it thrives in damp, boggy conditions and makes a stunning focal point near water features.

Site Selection and Soil

Choose partial shade and consistently moist to wet soil. In cooler areas, shelter from drying winds. Plant in rich, humus-heavy soil; amend with compost. Gunnera is a heavy feeder—top-dress annually with well-rotted manure.

Ongoing Care

Remove damaged or dead leaves as they appear. In zone 7, apply a thick winter mulch (straw or leaves) over the crown for protection. Where not hardy, grow as an annual or overwinter crowns in a frost-free location.