Culvers Root is a perennial grown for its white blooms, which open in summer and return year after year. It's hardy across USDA zones 3 through 8. Its summer flowers are a real draw for honeybees, native bees, and butterflies.
Zones
3-8
pH Range
5.5-7.5
Sun
Full Sun
Days to Maturity
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Score Culvers Root on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether culvers root actually takes — and those shift from one yard to the next. Enter your address and we'll score culvers root against your land's real conditions.
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What Culvers Root is
Culvers Root grows as a perennial and reaches around five feet at maturity. It blooms white in summer.
How to grow Culvers Root
Culvers Root grows in USDA zones 3 through 8. Culvers Root does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 7.5, on well-drained ground.
USDA Zones
3-8
USDA PHZM 2023
Soil pH
5.5 - 7.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Mature Height
5 ft
plant_species_v5.csv
Start the season right
Plant culvers root in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Culvers Root prefers pH 5.5 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.
Harvest at its peak
Cut culvers root blooms in the cool of the morning, just as they open, for the longest display.
Good to know
Good news for pet owners — culvers root isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Culvers Root is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Culvers Root thrives
Culvers Root is hardy across USDA zones 3 through 8. 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 3–8·Where Culvers Root growsOpen map →
On USDA hardiness-zone overlap, Culvers Root can grow in these states:
See if Culvers Root will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether culvers root 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 Culvers Root in my zone?
Culvers Root grows in USDA hardiness zones 3 through 8 (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 Culvers Root?
Most growers plant culvers root after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Culvers Root need?
Culvers Root 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 Culvers Root need?
Culvers Root prefers soil pH 5.5 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 Culvers Root attract pollinators?
Yes — culvers root's flowers are a strong nectar and pollen source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Culvers Root safe for pets?
Culvers Root is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.