During the summer I left it in a tray with approx 2in depth of water. Gunnera is the most incredibly architectural plant and loves wet soils and humid conditions. It achieves up to 4m in height if planted in the ground but it will tolerate pot culture as long as sufficient food and moisture are added to a large pot. Over winter allow the plant to dry off a little and protect the roots from frost. Wrap the pot and crown in horticultural fleece.
Some gardeners stuff the crown of the plant with straw to aid insulation.
Once growth restarts in spring remove the fleece during warm weather but re-cover if frosts are forecast. Once frosts have passed feed and water well for a real monster specimen. Schefflera compacta My wife bought me Schefflera compacta for Christmas. Unfortunately it spent the days leading up to the festive period in the shed. Although it initially perked up after coming into the warm, it now has started to wilt from the bottom up with the leaves on the lowest stems going a reddish brown.