Chinese Loosestrife

A low, fast creeper from central and southern China, Lysimachia christinae runs flat across the ground on slender trailing stems set with rounded, light green paired leaves, rooting as it goes. Small yellow star flowers open in the leaf axils from late spring through summer.
It closes ground quickly in moist, part-shaded positions and spills well over the edge of a raised bed or planter, which is where most schemes use it.
Chinese Loosestrife is the fast-closing groundcover for moist, shaded and marginal positions.