Your ‘Fire and Ice’ should overwinter well, but do not do this too early

This is a hosta, and the variety you name, ‘Fire and Ice’, normally overwinters well outdoors in a border in Sweden. In late August, do very little beyond letting it stand and continue building reserves before dormancy.

Wait until the leaves have yellowed or wilted after frost. Then cut the dead growth to a few centimetres above the ground and remove the leaf remains, especially if damaged or unsightly. This reduces the chance of slugs and debris remaining tucked into the plant over winter.

Then add a light winter mulch around the root zone, rather than a thick, wet cushion in the centre of the plant. A couple of centimetres of leaves, fine bark or compost is enough. The aim is to moderate changes between thaw and frost, not keep it warm like a houseplant.