Ophiopogon planiscapus
"Black Mondo Grass"

Black as midnight on a moonless night...and slow as molasses in Winter! Blackest foliage makes a great accent in containers or a front of the border specimen. Very slow growing, eventually forming a clump 6-12" wide and tall. The black color is very stable and would look fabulous paired with chartreuse Alchemilla mollis or silver Dichondra argentea. Originally from Japan and Korea, the black form was developed in England. Tiny spikes of white flowers appear in late Spring, followed by black berries. Rich soil is best.
Average water

USDA zones 6-10