Troubleshooting
Black Mondo Grass problems — and how to fix them
Black Mondo Grass (Ophiopogon planiscapus 'Nigrescens') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Loss of black colour
In deep shade or poor light the leaves revert toward green. Site in full sun to light shade for the darkest, near-black foliage.
Very slow spread
One of the slowest groundcovers to fill in. Plant in close-spaced drifts and allow several seasons; divide periodically to bulk up stock.
Root/crown rot in wet soil
Heavy, waterlogged ground rots the crown. Ensure free drainage and avoid winter-wet, compacted positions.
Wind/cold leaf damage
Exposed, cold sites can brown the leaf tips. Trim damaged foliage in early spring to tidy and encourage fresh growth.
Prevent black mondo grass problems before they start
Most black mondo grass issues are care-mismatch, not bad luck. Dial in the basics:
- Common black mondo grass problems — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Black Mondo Grass watering schedule
- Black Mondo Grass light requirements
- Best soil mix for black mondo grass
- Black Mondo Grass temperature & humidity
- Full black mondo grass care guide
Looking for black mondo grass in general rather than its problems? Read the full black mondo grass care guide — light, water, soil and feeding.
Black Mondo Grass problems — FAQ
Why is my black mondo grass loss of black colour?
In deep shade or poor light the leaves revert toward green. Site in full sun to light shade for the darkest, near-black foliage.
Why is my black mondo grass very slow spread?
One of the slowest groundcovers to fill in. Plant in close-spaced drifts and allow several seasons; divide periodically to bulk up stock.
Why is my black mondo grass root/crown rot in wet soil?
Heavy, waterlogged ground rots the crown. Ensure free drainage and avoid winter-wet, compacted positions.
Why is my black mondo grass wind/cold leaf damage?
Exposed, cold sites can brown the leaf tips. Trim damaged foliage in early spring to tidy and encourage fresh growth.