Cogon 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 8 through 13, shrugs off deer and shrugs off dry spells.
Zones
8-13
pH Range
4-7.5
Sun
Full Sun
Days to Maturity
120
Score Cogon Grass on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether cogon grass actually takes — and those shift from one yard to the next. Enter your address and we'll score cogon grass against your land's real conditions.
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What Cogon Grass is
Cogon Grass grows as a perennial and reaches around four feet at maturity. It's also deer-resistant.
How to grow Cogon Grass
Cogon Grass grows in USDA zones 8 through 13. Cogon Grass does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4 to 7.5, on evenly moist to well-drained ground. It needs around 2,000 growing degree days to mature and a growing season of at least 90 frost-free days, which is why climate matters as much as soil.
USDA Zones
8-13
USDA PHZM 2023
Soil pH
4 - 7.5
USDA PLANTS Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
poorly (saturated >50% of year), well (dry spells)
Growable Ground plant catalog
Frost Tolerance
68°F
The lowest temperature it shrugs off — below this, expect damage without cover.
Growable Ground plant catalog
Days to Maturity
120 days
Growable Ground plant catalog
GDD Required
2000+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
Growable Ground plant catalog
Mature Height
4 ft
Growable Ground plant catalog
Frost-Free Days
90+
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 cogon grass in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Cogon Grass prefers pH 4 to 7.5 (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 cogon 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 — cogon grass isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Cogon Grass isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Cogon Grass thrives
Cogon Grass is hardy across USDA zones 8 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 8–13·Where Cogon Grass growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Cogon Grass can grow in these states:
See if Cogon Grass will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether cogon 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 Cogon Grass in my zone?
Cogon Grass grows in USDA hardiness zones 8 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 Cogon Grass?
Most growers plant cogon grass after the last spring frost, once the soil has warmed, leaving enough of the season for its 90-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 Cogon Grass need?
Cogon Grass needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Cogon Grass need?
Cogon Grass prefers soil pH 4 to 7.5, on evenly moist to well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Cogon Grass attract pollinators?
Cogon 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 Cogon Grass safe for pets?
Cogon Grass is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)