Sue Says
A north facing position will be shadier and colder than a traditional south or west facing rockery. However there are plenty of plants that will enjoy this situation as it should not be quite so hot and dry in summer. There are lots of low growing shrubs and perennials that are not technically considered to be alpines but can be incorporated into a rockery to good effect such as primroses, omphalodes, some saxifrages, ferns, pulmonaria and violas. Is is worth considering growing bulbs such as narcissus, snowdrops, and cyclamen.