Purple Prairie Clover is a perennial grown for its purple blooms, which open in summer and return year after year. It's hardy across USDA zones 4 through 10. Its summer flowers are a real draw for native bees and butterflies. A nitrogen-fixer, it draws nitrogen from the air and feeds it back to the soil — turn it under or leave the roots in place, and the next planting inherits a richer bed.
Zones
4-10
pH Range
6-8
Sun
Full Sun
Days to Maturity
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Score Purple Prairie Clover on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether purple prairie clover actually takes — and those shift from one yard to the next. Enter your address and we'll score purple prairie clover against your land's real conditions.
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What Purple Prairie Clover is
Purple Prairie Clover grows as a perennial and reaches around two feet at maturity. It blooms purple in summer.
How to grow Purple Prairie Clover
Purple Prairie Clover grows in USDA zones 4 through 10. Purple Prairie Clover does best in full sun — at least 6 hours of direct sun a day — and soil from pH 6 to 8. It needs a growing season of at least 120 frost-free days, which is why climate matters as much as soil.
USDA Zones
4-10
USDA PHZM 2023
Soil pH
6 - 8
USDA PLANTS Database
Sun
Full Sun
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Drainage
Data pending
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Frost Tolerance
-38°F
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Mature Height
2 ft
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Frost-Free Days
120+
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Start the season right
Plant purple prairie clover in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Purple Prairie Clover prefers pH 6 to 8 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band. It fixes its own nitrogen, so skip the high-nitrogen feed and instead dust the seed with a matching rhizobium inoculant at sowing.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at its peak
Cut purple prairie clover blooms in the cool of the morning, just as they open, for the longest display.
Good to know
Good news for pet owners — purple prairie clover isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Purple Prairie Clover is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Purple Prairie Clover thrives
Purple Prairie Clover is hardy across USDA zones 4 through 10. 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 4–10·Where Purple Prairie Clover growsOpen map →
On USDA hardiness-zone overlap, Purple Prairie Clover can grow in these states:
See if Purple Prairie Clover will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether purple prairie clover 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 Purple Prairie Clover in my zone?
Purple Prairie Clover grows in USDA hardiness zones 4 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 Purple Prairie Clover?
Most growers plant purple prairie clover after the last spring frost, once the soil has warmed, leaving enough of the season for its 120-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 Purple Prairie Clover need?
Purple Prairie Clover 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 Purple Prairie Clover need?
Purple Prairie Clover prefers soil pH 6 to 8 (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Purple Prairie Clover attract pollinators?
Yes — purple prairie clover's flowers are a strong nectar and pollen source for native bees and butterflies (Xerces Society, Pollinator Partnership).
Is Purple Prairie Clover safe for pets?
Purple Prairie Clover is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.