The creeping shrub hugs the ground, growing to only two inches in height. As the stems spread out, the branch and leaf nodes develop roots and anchor themselves into the soil. Eventually the slow-growing plant forms a dense carpet that may be several meters across. This scrambling cover spills down slopes and skirts the base of trees. By favoring such inclines, partridgeberry shrugs off fallen leaves that could otherwise smother it."
So there we have it! Mystery solved.