Ophiopogon planiscapus is a species of flowering plant in the family Asparagaceae.

[1] It grows from short rhizomes, and bears tufts of grasslike leaves, from which purple or white flowers emerge in racemes held on short stems above the leaves.

[2][3] The cultivar 'Kokuryu' (black mondo) is grown as groundcover, or as underplanting for larger shrubs.

[4] It has received the Royal Horticultural Society's Award of Garden Merit.

[6] The plants spread by underground stolons with thick fleshy roots making fair sized colonies which can be separated by division in the spring.