What plants can stay outside all year?
Evergreen shrubs and trees are the backbone of a winter garden, maintaining their foliage all year round. Popular varieties include holly, juniper, and boxwood, which offer structure and greenery when other plants have shed their leaves. Annuals grown in containers are discarded at the end of the season, but many potted perennials, shrubs and small trees can be maintained over the winter if steps are taken to protect the plants and their containers. The more cold-hardy the plants, the more likely you are to succeed in keeping them alive.