Japanese Forest Grass is a perennial grown for its green blooms, which open in summer and return year after year. It's hardy across USDA zones 5 through 9, shrugs off deer and grows just as well in a container as in the ground.
Zones
5-9
pH Range
5.5-7
Sun
Shade
Days to Maturity
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Score Japanese Forest Grass on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether japanese forest grass actually takes — and those shift from one yard to the next. Enter your address and we'll score japanese forest grass against your land's real conditions.
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What Japanese Forest Grass is
Japanese Forest Grass grows as a perennial and reaches around a foot and a half at maturity. It blooms green in summer. It's also deer-resistant and well suited to containers.
How to grow Japanese Forest Grass
Japanese Forest Grass grows in USDA zones 5 through 9. Japanese Forest Grass does best in shade — at least 2 hours of direct sun a day — and soil from pH 5.5 to 7, on well-drained ground. It needs a growing season of at least 120 frost-free days, which is why climate matters as much as soil.
USDA Zones
5-9
USDA PHZM 2023
Soil pH
5.5 - 7
USDA PLANTS Database
Sun
Shade
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Mature Height
1.5 ft
Growable Ground plant catalog
Frost-Free Days
120+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Start the season right
Plant japanese forest grass in shade with at least 2 hours of direct sun. It grows in the cool halves of the year, so sow it in spring or late summer rather than waiting for midsummer heat.
Match the soil
Japanese Forest Grass prefers pH 5.5 to 7 (Growable Ground Plant Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut japanese forest grass blooms in the cool of the morning, just as they open, for the longest display.
Good to know
Good news for pet owners — japanese forest grass isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Japanese Forest Grass isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Japanese Forest Grass thrives
Japanese Forest Grass is hardy across USDA zones 5 through 9. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 5–9·Where Japanese Forest Grass growsOpen map →
On USDA hardiness-zone overlap, Japanese Forest Grass can grow in these states:
See if Japanese Forest Grass will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether japanese forest grass actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Japanese Forest Grass in my zone?
Japanese Forest Grass grows in USDA hardiness zones 5 through 9 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Japanese Forest Grass?
Japanese Forest Grass is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Japanese Forest Grass need?
Japanese Forest Grass is shade-tolerant — it gets by on as little as 2 hours of direct sun, so it earns a place most vegetables can't use. A north-facing strip or the ground under a leafy canopy is right where it belongs. A Growable Ground report shows which corners of your land stay shaded through the day, turning those dim spots into planting spots.
What soil does Japanese Forest Grass need?
Japanese Forest Grass prefers soil pH 5.5 to 7, on well-drained ground (Growable Ground Plant Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Japanese Forest Grass attract pollinators?
Japanese Forest Grass isn't classified as a notable pollinator plant in our data. Pairing it with high-value bloomers nearby keeps bees and butterflies fed.
Is Japanese Forest Grass safe for pets?
Japanese Forest Grass is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)