Scallion is a perennial grown for the harvest, ready about 75 days after sowing. It's hardy across USDA zones 3 through 9 and stands up to deer. Its flowers are a moderate draw for honeybees, native bees, and butterflies, even though the harvest is the prize. As an allium (the onion family), give it a fresh bed each year — away from where its relatives just grew — so the soil-borne pests and diseases of the family never get a foothold.
Zones
3-9
pH Range
5.5-8.5
Sun
Full Sun
Days to Maturity
75
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What Scallion is
Scallion grows as a perennial and reaches around a foot and a half at maturity. It's also deer-resistant.
How to grow Scallion
Scallion grows in USDA zones 3 through 9 and is ready to harvest about 75 days after planting. Scallion does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 8.5, on well-drained ground. It needs around 1,100 growing degree days to mature and a growing season of at least 60 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-9
USDA PHZM 2023
Soil pH
5.5 - 8.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
42.8°F
plant_species_v5.csv
Days to Maturity
75 days
Bunching onion / scallion.
OSU-PNW
GDD Required
1100+
plant_species_v5.csv
Mature Height
1.5 ft
plant_species_v5.csv
Frost-Free Days
60+
plant_species_v5.csv
Start the season right
Plant scallion in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Scallion prefers pH 5.5 to 8.5 (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 maturity
Scallion is ready about 75 days after sowing (OSU-PNW). Watch for cultivar-specific ripeness cues and pick at peak.
Good to know
One caution for pet owners — scallion 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.)
Scallion offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Scallion thrives
Scallion 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 Scallion growsOpen map →
On USDA hardiness-zone overlap, Scallion can grow in these states:
See if Scallion will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether scallion 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 Scallion in my zone?
Scallion 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.
How long does Scallion take to grow?
Scallion is ready to harvest about 75 days after planting (OSU-PNW). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Scallion?
Most growers plant scallion after the last spring frost, once the soil has warmed, leaving enough of the season for its 60-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 Scallion need?
Scallion 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 Scallion need?
Scallion prefers soil pH 5.5 to 8.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Scallion attract pollinators?
Yes — scallion's flowers are a solid nectar source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Scallion safe for pets?
Scallion 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.