Whorled Milkweed 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 9, shrugs off deer and shrugs off dry spells. Its summer flowers are a real draw for honeybees, native bees, butterflies, and moths.
Zones
3-9
pH Range
5.5-7.5
Sun
Full Sun
Days to Maturity
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Zone averages can't see the slope, soil, frost, and sun that decide whether whorled milkweed actually takes — and those shift from one yard to the next. Enter your address and we'll score whorled milkweed against your land's real conditions.
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What Whorled Milkweed is
Whorled Milkweed grows as a perennial and reaches around two feet at maturity. It blooms white in summer. It's also deer-resistant.
How to grow Whorled Milkweed
Whorled Milkweed grows in USDA zones 3 through 9. Whorled Milkweed 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
3-9
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
2 ft
plant_species_v5.csv
Start the season right
Plant whorled milkweed in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Whorled Milkweed 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 whorled milkweed blooms in the cool of the morning, just as they open, for the longest display.
Good to know
One caution for pet owners — whorled milkweed 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: ASPCA.)
Whorled Milkweed is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Whorled Milkweed thrives
Whorled Milkweed is hardy across USDA zones 3 through 9. 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 3–9·Where Whorled Milkweed growsOpen map →
On USDA hardiness-zone overlap, Whorled Milkweed can grow in these states:
See if Whorled Milkweed will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether whorled milkweed 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 Whorled Milkweed in my zone?
Whorled Milkweed grows in USDA hardiness zones 3 through 9 (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 Whorled Milkweed?
Most growers plant whorled milkweed 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 Whorled Milkweed need?
Whorled Milkweed 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 Whorled Milkweed need?
Whorled Milkweed 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 Whorled Milkweed attract pollinators?
Yes — whorled milkweed's flowers are a strong nectar and pollen source for honeybees, native bees, butterflies, and moths (Xerces Society, Pollinator Partnership).
Is Whorled Milkweed safe for pets?
Whorled Milkweed 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.