Guinea Grass is a cover crop — grown to build and protect the soil rather than for a harvest of its own. It's hardy across USDA zones 9 through 13. It roots deep, which helps it reach moisture in a dry spell and open up tight soil as it establishes.
Zones
9-13
pH Range
3.5-8.4
Sun
Part Sun
Days to Maturity
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Score Guinea Grass on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether guinea grass actually takes — and those shift from one yard to the next. Enter your address and we'll score guinea grass against your land's real conditions.
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How to grow Guinea Grass
Guinea Grass grows in USDA zones 9 through 13. Guinea Grass does best in part sun — at least 4 hours of direct sun a day — and soil from pH 3.5 to 8.4, on well-drained ground. It needs a growing season of at least 70 frost-free days, which is why climate matters as much as soil.
USDA Zones
9-13
USDA PHZM 2023
Soil pH
3.5 - 8.4
USDA PLANTS Database
Sun
Part Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Frost Tolerance
42.8°F
The lowest temperature it shrugs off — below this, expect damage without cover.
Growable Ground plant catalog
Frost-Free Days
70+
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 guinea grass in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Guinea Grass prefers pH 3.5 to 8.4 (FAO ECOCROP). 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.
Turn it in before it seeds
Cut guinea grass down or turn it into the soil before it sets seed, while the growth is still green — that's when it returns the most to the ground.
Good to know
Good news for pet owners — guinea grass isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Guinea Grass isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Guinea Grass thrives
Guinea Grass is hardy across USDA zones 9 through 13. 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 9–13·Where Guinea Grass growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Guinea Grass can grow in these states:
See if Guinea Grass will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether guinea 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 Guinea Grass in my zone?
Guinea Grass grows in USDA hardiness zones 9 through 13 (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 Guinea Grass?
Most growers plant guinea grass after the last spring frost, once the soil has warmed, leaving enough of the season for its 70-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Guinea Grass need?
Guinea Grass does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Guinea Grass need?
Guinea Grass prefers soil pH 3.5 to 8.4, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Guinea Grass attract pollinators?
Guinea 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 Guinea Grass safe for pets?
Guinea Grass is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)