Penny Black Nemophila Descoidalis. Beautiful for rock gardens, borders, containers, and window boxes. A low spreading plant, deep purple to black blooms with scalloped silvery white edges. Penny Black has continually been a favorite variety with gardeners. Type: Annual. Light: Sun/Part Shade. Height: 6". Days to Germination: 7-21. Blooms: Mid-Summer to Late Fall 20 Seeds, 200 mg