White Yam is a perennial grown for its root. It's hardy across USDA zones 10 through 12. Its flowers are a modest draw for native bees, even though the root is the prize. It roots deep, which helps it reach moisture in a dry spell and open up tight soil as it establishes.
Zones
10-12
pH Range
5.8-8.5
Sun
Full Sun
Days to Maturity
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Score White Yam on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether white yam actually takes — and those shift from one yard to the next. Enter your address and we'll score white yam against your land's real conditions.
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See White Yam
What White Yam is
White Yam grows as a perennial.
How to grow White Yam
White Yam grows in USDA zones 10 through 12. White Yam does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.8 to 8.5, on well-drained ground. It needs a growing season of at least 180 frost-free days, which is why climate matters as much as soil.
USDA Zones
10-12
USDA PHZM 2023
Soil pH
5.8 - 8.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
59°F
plant_species_v5.csv
Frost-Free Days
180+
plant_species_v5.csv
Sow directly
Sow white yam seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
White Yam prefers pH 5.8 to 8.5 (USDA PLANTS 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 maturity
Pull while roots are young and tender — sweeter than oversized ones. Local Cooperative Extension guides publish timing tables.
Good to know
One caution for pet owners — white yam is toxic to dogs and cats (mild severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
White Yam offers low value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where White Yam thrives
White Yam is hardy across USDA zones 10 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 10–12·Where White Yam growsOpen map →
On USDA hardiness-zone overlap, White Yam can grow in these states:
See if White Yam will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether white yam actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow White Yam in my zone?
White Yam grows in USDA hardiness zones 10 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 White Yam?
Most growers plant white yam after the last spring frost, once the soil has warmed, leaving enough of the season for its 180-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 White Yam need?
White 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 White Yam need?
White Yam prefers soil pH 5.8 to 8.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does White Yam attract pollinators?
Yes — white yam's flowers are a modest nectar source for native bees (Xerces Society, Pollinator Partnership).
Is White Yam safe for pets?
White Yam is toxic to pets (dogs,cats) with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.