Rubus irenaeus

Rubus irenaeus is a raspberry that has forgotten how to be a bramble. Rather than the arching, thorny canes of the fruiting kinds, the plant trails flat along the ground on downy, weakly prickled stems, laying down a dense evergreen carpet of large, rounded, coltsfoot-like leaves, each six inches or more across, dark and glossy above and felted pale brown beneath. Few groundcovers of any kind bring foliage this bold to deep shade.

The species hails from the mountains of central and western China and reached Western gardens around 1900, one of the many treasures the great collector Ernest Henry Wilson sent home to the Veitch nursery. Rubus is the ancient Latin name for the brambles, a vast and famously enthusiastic genus of blackberries and raspberries; irenaeus, from the Greek for peaceful, sets this quiet, well-mannered groundcover gently apart from the running, scrambling habits of the tribe. In leaf the plant reads more like a wild ginger or a bergenia than any raspberry.

Woodlanders obtained this rarity many years ago from a garden in Sumter, South Carolina, where the plant was quietly in cultivation, and have not met with it anywhere else in the South since. In early summer, upright stems rise above the leafy mat to carry small, white, five-petaled flowers, and by late summer these give way to little orange-red raspberries, edible if modest, and much appreciated by bees, butterflies, and birds. The fruit is a bonus rather than a crop, borne on a plant grown above all for the foliage.

In the garden, few evergreens will carpet full, dry shade with leaves this large and handsome, though the plant is just as content in sun given steady moisture. Run Rubus irenaeus beneath shrubs and high canopy, down a shaded bank, or along a woodland path where the bold, bronze-flushed leaves can be read at close range, and pair with ferns, hellebores, and other shade companions of finer texture. A rare, quietly aristocratic groundcover for the difficult places where ordinary carpets give up.