Buckwheat 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 3 through 10. Its mid summer flowers are a real draw for honeybees, native bees, and butterflies.
Zones
3-10
pH Range
4.4-7.5
Sun
Full Sun
Days to Maturity
45
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Zone averages can't see the slope, soil, frost, and sun that decide whether buckwheat actually takes — and those shift from one yard to the next. Enter your address and we'll score buckwheat against your land's real conditions.
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What Buckwheat is
Buckwheat grows as an annual and reaches around 2.5 feet at maturity. It blooms white in mid summer.
How to grow Buckwheat
Buckwheat grows in USDA zones 3 through 10. Buckwheat does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.4 to 7.5, on well-drained ground. It needs around 1,100 growing degree days to mature and a growing season of at least 55 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-10
USDA PHZM 2023
Soil pH
4.4 - 7.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
44.6°F
plant_species_v5.csv
Days to Maturity
45 days
Buckwheat; cover crop; no strat.
USDA-NRCS
GDD Required
1100+
plant_species_v5.csv
Mature Height
2.5 ft
plant_species_v5.csv
Frost-Free Days
55+
plant_species_v5.csv
Start the season right
Plant buckwheat in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Buckwheat prefers pH 4.4 to 7.5 (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.
Turn it in before it seeds
Cut buckwheat 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 — buckwheat isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Buckwheat is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Buckwheat thrives
On hardiness alone, buckwheat grows across most of the country — its range (USDA zones 3 through 10) is unusually wide. 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 3–10·Where Buckwheat growsOpen map →
On USDA hardiness-zone overlap, Buckwheat can grow in these states:
See if Buckwheat will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether buckwheat 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 Buckwheat in my zone?
Buckwheat grows in USDA hardiness zones 3 through 10 (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 Buckwheat?
Most growers plant buckwheat after the last spring frost, once the soil has warmed, leaving enough of the season for its 55-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 Buckwheat need?
Buckwheat 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 Buckwheat need?
Buckwheat prefers soil pH 4.4 to 7.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Buckwheat attract pollinators?
Yes — buckwheat's flowers are a strong nectar and pollen source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Buckwheat safe for pets?
Buckwheat is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.