Lupine is grown for its blooms, which open in summer. It's hardy across USDA zones 4 through 7 and shrugs off deer. 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
4-7
pH Range
4.9-8.2
Sun
Full Sun
Days to Maturity
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What Lupine is
Lupine reaches around four feet at maturity. It blooms in summer. It's also deer-resistant.
How to grow Lupine
Lupine grows in USDA zones 4 through 7. Lupine does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.9 to 8.2, on well-drained ground. It needs a growing season of at least 100 frost-free days, which is why climate matters as much as soil.
USDA Zones
4-7
USDA PHZM 2023
Soil pH
4.9 - 8.2
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
39.2°F
plant_species_v5.csv
Mature Height
4 ft
plant_species_v5.csv
Frost-Free Days
100+
plant_species_v5.csv
Start the season right
Plant lupine in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Lupine prefers pH 4.9 to 8.2 (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. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut lupine blooms in the cool of the morning, just as they open, for the longest display.
Good to know
One caution for pet owners — lupine is toxic to dogs and cats and horses (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Lupine is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Lupine thrives
Lupine is hardy across USDA zones 4 through 7. 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 4–7·Where Lupine growsOpen map →
On USDA hardiness-zone overlap, Lupine can grow in these states:
See if Lupine will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether lupine 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 Lupine in my zone?
Lupine grows in USDA hardiness zones 4 through 7 (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 Lupine?
Most growers plant lupine after the last spring frost, once the soil has warmed, leaving enough of the season for its 100-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 Lupine need?
Lupine 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 Lupine need?
Lupine prefers soil pH 4.9 to 8.2, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Lupine attract pollinators?
Yes — lupine's flowers are a strong nectar and pollen source for native bees and butterflies (Xerces Society, Pollinator Partnership).
Is Lupine safe for pets?
Lupine is toxic to pets (dogs,cats,horses) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.