Use a sharp knife or secateurs to cut away any frosted or dying lower leaves. This will prevent them from rotting when the plant is wrapped up for winter.
Wrap a roll of rush screening or chicken wire loosely around the plant, and pack the gap between the plant and the covering with dry straw.
Tie the screening or chicken wire securely in place with string or rope.
Remove the covering in April or May, or after the last frosts.