Asarum megacalyx makes a superb evergreen groundcover patch that reaches 2' wide in 5 years. The glossy dark green foliage of Asarum 'Green Sheen' hides the huge thumb-sized dark purple flowers that appear in late February to early March in NC. When we grew this in deep shade, we only saw a few scattered flowers, but when planted in a site that received a couple of hours of afternoon sun, it produced hundreds of flowers...amazing. This is a form of the northern Honshu, Japan native that we originally received from Eco Gardens. Asarum megacalyx 'Green Sheen' has very dark, shiny green leaves, which emerge nicely patterned, but only in spring. Slightly moist, organic soils make the best habitat.