How to Grow Mondo Grass
Wikimedia Commons
Mondo Grass
Ophiopogon japonicus
grassMondo grass is a low-growing, evergreen groundcover that forms dense, dark green mounds of fine, grass-like foliage. Despite its common name, it is not a true grass but a herbaceous perennial in the lily family. It's prized for its ability to create elegant borders, fill gaps in shade areas, and tolerate foot traffic.
When should you plant Mondo Grass in your zone?
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Example Mondo Grass timeline · Pittsburgh, PA (Zone 6b)
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Plant 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 Mondo Grass
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Mondo Grass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5b-10a; most vigorous in zones 7-9
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Planting & Establishment
4-6 weeksSmall plugs or divisions are planted with minimal visible growth above soil. Root development is the primary focus.
Keep soil consistently moist for 4-6 weeks. Mulch lightly to retain moisture and regulate soil temperature. Avoid foot traffic until established.
Vegetative Growth
8-12 weeksGrass-like shoots emerge and expand, forming low mounds of fine foliage. Plants gradually spread via rhizomes.
Continue moderate watering. Apply balanced fertilizer monthly during growing season (spring and summer). Remove any weeds competing for space.
Filling & Maturation
8-16 weeksPlants expand laterally and fill in gaps, creating dense mounds 6-12 inches tall. Growth slows in fall and winter.
Reduce watering as plant matures. Fertilize every 6-8 weeks. Prune back any leggy growth in late winter.
Flowering
4-8 weeksSmall, delicate purple or white flowers emerge on thin spikes above foliage in late summer to early fall.
Flowers are ornamental but not showy. No special care needed. Allow flowers to remain for wildlife interest.
Fruiting & Winter Dormancy
8-16 weeksFlowers develop into small, metallic blue berries that persist into winter. Foliage remains evergreen but growth halts.
Reduce or cease fertilizing. Water only if soil becomes very dry. Allow berries to remain for ornamental value and bird food.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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and
Hand-pick in early morning, use slug baits, encourage natural predators like toads and beetles
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Increase humidity, spray foliage with water, apply insecticidal soap if severe
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Prune affected areas, apply horticultural oil or insecticidal soap in spring before new growth
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Improve air circulation, avoid overhead watering, remove affected foliage, apply fungicide if persistent
Uses
Ornamental Groundcover
HouseholdMondo grass serves as an elegant, low-maintenance groundcover for shade gardens, borders, and pathway edging. Its fine texture and dark green color provide year-round visual interest and structure to garden designs. [source]
Shade Garden Solution
HouseholdAs one of the most shade-tolerant groundcovers available, mondo grass thrives under trees, near buildings, and in other low-light areas where many plants struggle. [source]
Wildlife Support
WildlifeThe metallic blue berries produced in fall provide food for birds and other wildlife. The dense foliage creates habitat for beneficial insects and small animals. [source]
Lawn Alternative
HouseholdMondo grass can be used as a decorative, non-mowable alternative to traditional turf grass in small areas, creating a manicured appearance with minimal maintenance. [source]
Container & Edging
HouseholdThe compact, mounding growth habit makes mondo grass ideal for containers, raised beds, and decorative borders, providing soft, fine-textured edges to hardscape features. [source]
Harvest Tips
Mondo grass is not harvested for food or typical ornamental cutting. Divide established plants in spring or fall to propagate new plants. Dig carefully to separate clumps of rhizomes, ensuring each division has several shoots and roots.
Fun Facts
- 🌱 Despite its common name, mondo grass is not a true grass at all—it is a member of the Ruscaceae (Liliaceae) family, making it more closely related to lily of the valley than to lawn grasses.
- 🌱 The metallic blue berries that appear in fall are toxic to humans but are relished by birds and are sometimes the only sign of flowering that most gardeners notice.
- 🌱 Mondo grass can tolerate salt spray and poor soil conditions, making it an excellent choice for coastal gardens and challenging urban landscapes where conventional plants struggle.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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