Potato Yam is a perennial grown for the harvest. It's hardy across USDA zones 9 through 12. Its flowers are a modest draw for native bees, even though the harvest is the prize. It roots deep, which helps it reach moisture in a dry spell and open up tight soil as it establishes.
Zones
9-12
pH Range
5.3-8
Sun
Full Sun
Days to Maturity
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Score Potato Yam on your exact land.
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What Potato Yam is
Potato Yam grows as a perennial.
How to grow Potato Yam
Potato Yam grows in USDA zones 9 through 12. Potato Yam does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.3 to 8, on well-drained ground. It needs a growing season of at least 90 frost-free days, which is why climate matters as much as soil.
USDA Zones
9-12
USDA PHZM 2023
Soil pH
5.3 - 8
USDA PLANTS Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Frost Tolerance
53.6°F
The lowest temperature it shrugs off — below this, expect damage without cover.
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 potato yam in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Potato Yam prefers pH 5.3 to 8 (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.
Harvest at maturity
Watch for cultivar-specific ripeness cues and pick at peak. Local Cooperative Extension guides publish timing tables.
Good to know
One caution for pet owners — potato yam is toxic to dogs and cats (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Potato Yam offers low value to bees and other pollinators.
Before you harvest potato yam, know your soil
Anything you grow to eat takes up what's in the ground it grows in, so it's worth knowing what's documented near you before you plant potato yam for food. Our free screen reads 9 federal source types across roughly 1.8M indexed sites and shows which sit near your address and which way they drain. It's a screening estimate from public records and proximity — not a soil test — so a nearby record means a soil test is worth it, not that your soil is unsafe.
Where Potato Yam thrives
Potato Yam is hardy across USDA zones 9 through 12. 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 9–12·Where Potato Yam growsOpen map →
On USDA hardiness-zone overlap, Potato Yam can grow in these states:
See if Potato Yam will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether potato yam 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 Potato Yam in my zone?
Potato Yam grows in USDA hardiness zones 9 through 12 (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 Potato Yam?
Most growers plant potato yam 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 Potato Yam need?
Potato Yam 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 Potato Yam need?
Potato Yam prefers soil pH 5.3 to 8, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Potato Yam attract pollinators?
Yes — potato yam's flowers are a modest nectar source for native bees.
Is Potato Yam safe for pets?
Potato Yam is toxic to pets (dogs,cats) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)