Persicaria Affinis. A small mat forming creeping perennial with shimmering green leaves similar to a dock leaf but much smaller. In spring / summer spikes of tiny pale pink flowers rise above the foliage. This perennial is an easy carefree plant that grows in most situations happy in rockeries to border gardens and beyond. They are semi evergreen depending on how cold your winters get. Full sun to part shade. 15cm by 50cm.