Brunnera, Siberian Bugloss. Handsome and undemanding, this ground cover forms large, tidy basal clumps of long-petioled, broad foliage, and displays charming vivid blue flowers that begin blooming in early spring and persist through Memorial Day. Preferring some shade and moisture, Brunnera is at home by water's edge, en masse in the border, or as a filler between newly planted shrubs.