Here in Oswego, NY, which is almost as cold as Chicago but much more snowy, Asarum europaeum is a menace. It self-sows all over the place, and the seedlings don't tweak out easily - a weeding knife is usually needed. Beautiful, but dreadful stuff. Ellen Ellen Hornig 3712 Co. Rt. 57 Oswego NY 13126 Phone: 315-342-5573