The Story
Plant Bio
Ophiopogon planiscapus is a mondo grass species native to Japan, known for its tufted, grass-like, evergreen foliage and short spikes of summer flowers followed by blue-black berries. It spreads via rhizomes to form dense colonies.
This cultivar, often sold as 'Nigrescens', is celebrated for its unique, strap-like leaves that are so dark purple they appear black. This striking foliage provides year-round color and dramatic contrast in borders, rock gardens, and containers.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Groundcover
Height
8 inches
Width
12 inches
Light
Full Sun, Partial Sun, Shade
Zones
6, 7, 8, 9, 10
Water
Moderate
Humidity
Average
Lifespan
Perennial
Native To
Asia
Toxicity
Non-toxic to humans and pets
Bloom period
Late summer
In flower about 1 month of the year
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds or divisions into well-drained soil
- Water thoroughly after planting
- Place in partial to full sun for best color
- Mulch lightly to retain moisture
- Avoid overwatering in winter
- Expect new growth in early spring
Pro Tip
Ensure well-drained soil and partial sun for vibrant foliage color
Keep It Thriving
Care Guide
Do
- Water regularly during dry periods 🌱
- Mulch to conserve moisture
- Divide every 3-4 years to maintain vigor
Don't
- Overwater in winter ❌
- Plant in heavy clay soil without amendment ❌
- Expose to full shade for best color
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Fertilize | ||||||||||||
| Plant | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Black Mondo Grass questions
What zones can Black Mondo Grass grow in?
Black Mondo Grass is hardy in USDA Zones 6–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Black Mondo Grass deer resistant?
Yes — Black Mondo Grass is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Black Mondo Grass bloom?
Black Mondo Grass typically blooms in late summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Black Mondo Grass need full sun?
Black Mondo Grass does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
More Ophiopogon to compare
Gyoku Ryu Mondo Grass
Ophiopogon japonicus 'Gyoku Ryu'
Nigrescens Black Mondo Grass
Ophiopogon planiscapus 'Nigrescens'
Niger Black Mondo Grass
Ophiopogon planiscapus 'Niger'
Tuff Tuft Silver
Ophiopogon japonicus 'Tuff Tuft Silver'
Super Dwarf Mondo Grass
Ophiopogon japonicus 'Super Dwarf'
Mondo Grass
Ophiopogon japonicus
Keep exploring
Explore the genus
Hardy in your zone?
Grow Black Mondo Grass with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.