How to Grow Japanese Mondo Grass
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Japanese Mondo Grass
Ophiopogon japonicus
grassJapanese mondo grass is a low-growing, evergreen groundcover with dark green, grass-like foliage that forms dense clumps. It produces delicate pale purple or white flowers followed by ornamental blue-black berries. This hardy, shade-tolerant plant is popular for landscaping, edging, and underplanting in woodland gardens.
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Example Japanese Mondo Grass timeline · Pittsburgh, PA (Zone 6b)
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Plant Japanese Mondo Grass
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Japanese Mondo Grass
Around Apr 18≈ 1 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Japanese Mondo Grass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-10, most vigorous in zones 6-9
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Establishment
4-8 weeksNew plants are small clumps with limited foliage. Root system is developing
Keep soil consistently moist to encourage rooting. Protect from extreme heat and cold. Mulch lightly to retain moisture
Vegetative Growth
6-12 monthsClumps expand outward, producing more grass-like leaves. Plant fills in the space gradually
Water regularly during dry periods. Apply balanced fertilizer in spring. Remove any dead foliage
Flowering
4-6 weeks (mid-summer to early fall)Small delicate flowers appear on short spikes, typically pale purple, white, or lilac in color
Flowers are inconspicuous but attractive. No special care needed; allow flowering to occur naturally
Fruiting & Maturity
4-8 weeksSmall, ornamental blue-black berries develop after flowering. Plant is fully mature and dense
Berries persist into winter and are attractive to wildlife. Established plants are very low-maintenance
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity, spray with water, apply neem oil if severe
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Remove by hand, apply horticultural oil in dormant season
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and
Handpick, use slug baits, or create barriers with copper tape or diatomaceous earth
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Improve drainage, reduce watering frequency, remove affected plants
Uses
Ornamental Groundcover
HouseholdIdeal for creating dense, low-maintenance groundcover in shade areas, garden borders, and between stepping stones. Its fine texture and evergreen nature provide year-round visual interest and erosion control on slopes. [source]
Wildlife Support
WildlifeThe ornamental blue-black berries attract birds and other wildlife in fall and winter. Dense clumps provide shelter and nesting habitat for small creatures. [source]
Traditional Asian Medicine
MedicinalIn traditional Chinese medicine, Ophiopogon japonicus (called '麦冬' or mai dong) is used to moisten the lungs and nourish the yin. It is employed in herbal remedies for dry cough and respiratory conditions. [source]
Shade Garden Design
HouseholdPerfect for filling shady corners, under trees, and in woodland gardens where grass struggles to grow. Its compact growth habit makes it ideal for small spaces and containers. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Not typically harvested; grown as ornamental. Berries are ornamental only and should be left on plant for wildlife. Division for propagation can occur in spring or fall
Fun Facts
- 🌱 Japanese mondo grass is not actually a true grass, despite its common name—it belongs to the Asparagaceae family (related to asparagus and lilies)
- 🌱 The ornamental blue-black berries persist through winter and are actually quite attractive to birds, who help disperse seeds naturally
- 🌱 There is a dwarf cultivar called 'Nanus' that grows only 2-3 inches tall, making it perfect for small spaces and between pavers
Gardening Terms
New to gardening? Learn about terms used in this guide:
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