What hardiness zone will Gunnera grow/overwinter in?
Certified GKH Gardening Expert
Gunnera is winter hardy in zone 7 and warmer. In the cooler part of this range, they benefit from the protection of mulch (or their own cut down leaves) during the winter. In zone 6 and colder, the roots can be dug up and stored in a cool, dry location for planting the next spring.