10 Chilean Rhubarb Seed-Giant-Rhubarb -Huge Leaves (Gunnera Tinctoria) Perennial 10 Chilean Rhubarb Seed-Giant-Rhubarb -Huge Leaves (Gunnera Tinctoria) Perennial Gunnera is one of the biggest and most spectacular, architectural, herbaceous plants, commonly thought of as giant rhubarb. With gigantic, deeply lobed, deep green leaves up to 2 metres (6ft) across. The plants need a lot of space because it is difficult to restrict their size. They look best standing as specimen plants in a damp bog garden, or beside a large pond where the reflections reveal the undersides of the leaves. The stalks hold tiny red-brown flowers on erect panicles up to 1m (3ft) in height, followed by small red berry-like fruits. Sowing: Sow seeds as soon as possible. For maximum freshness, please keep seed refrigerated in its original packaging until you are ready to sow them. Fill a large pot (see below) with fertile moisture retentive medium. Sow thinly and evenly distribute seed over surface (don't touch seed as skin oils interfere with germination). Cultivation: Though considered hardy, Gunneras need special care in cold winter areas in order to survive. i.e. where winter temperatures are likely to drop below -5C (20F) Cut down all greenery in late October to 30cm (12) of the root ball then place a thick layer of dry mulch over the crown for the winter. The mulch should be kept dry by a tarp or other rain proofing material. Remove mulch when last spring frost is past. A heavy mulch can help these plants survive to -17C (0F)