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Ophiopogon planiscapus 'Nigrescens', black mondo grass berries (photo by Rosana Brien / My Garden Plot)

Black Mondo Grass Care

About Ophiopogon Planiscapus ‘Nigrescens’ (Black Mondo Grass, Black Lilyturf, Black Spider Grass, Monkey Grass)

Ophiopogon planiscapus ‘Nigrescens’ or, as more commonly known, black mondo grass, brings a dramatic purple-black – sometimes almost jet black – colour to the garden. Set against green foliage, it adds depth and interest with its distinctive dark spidery leaves. The information below will help you to where best to plant and how to grow and care for this ornamental grass perennial.

Ophiopogon planiscapus ‘Nigrescens’ is also known as black spider grass, black lilyturf or monkey grass. Though not a true grass, it provides a dense carpet of elegant grass-like foliage that is evergreen, deer resistant and low maintenance. It has attractive small dark flowers that bloom in late summer and early autumn, followed by purple-black jewel-like berries. The black mondo grass is suitable as an edging plant, groundcover, container gardening and just about perfect for a section that needs dense low foliage with minimum care that is easy to control. Black mondo grass is not only popular for its dynamic colour contrast in a garden but for its easy care. It is native to East Asia. Black mondo grass is not toxic to pets.

Black Mondo Grass At A Glance

Type: Evergreen Perennial / Ornamental Grass

Location: Full Sun / Part Shade

Seasonal Interest: Foliage Year-Round / Flowers Late Summer, Early Autumn / Berries Late Autumn, Early Winter

Size: 30 cm (12 in) Height, 20 cm (8 in) Spread

Cold Hardiness Zones: 6, 7, 8, 9

Ophiopogon planiscapus 'Nigrescens' Black Mondo Grass In December (photo by Rosana Brien / My Garden Plot)
Ophiopogon planiscapus 'Nigrescens' Black Mondo Grass In December (photo by Rosana Brien / My Garden Plot)

Where To Plant And How To Grow Black Mondo Grass

Grow black mondo grass in moist but well-drained soil in a sunny or partially shady site. Best to plant in spring to give it time to establish itself before the winter. When planting several new plants in one area, space about 15 cm (6 inches) apart.

Black mondo grass annual care is minimum. If planted in a sunny location, ensure it is watered regularly during the hot months. It is a slow starter but once established, it gets dense and is more drought-tolerant in a part shady location. It is also a great companion plant for patio planter.

Black mondo grass is not invasive nor a fast spreader. It is easy to divide the clumps in spring. Offshoots can be detached easily and replanted. The black mondo grass benefits from top-dressing with compost in spring. Additional fertilizer is not needed.

Pests And Diseases That Affect Black Mondo Grass

The black mondo grass is generally pest and disease-free. Slugs may munch the young foliage.

It is also deer resistant though rabbits may take a nibble.