Scallion Stat Summary
Plant Spacing: 1-3" (25-76 mm)
Row Spacing: 12-18" (304-457 mm)
Planting Depth: 1/4" (6 mm)
Plants Per Person: 6
Soil Temperature: 45-85°F (7-29°C)
Days to Emergence: 4-5
Recommended Soil PH: 6.2-6.8
Seed Indoors: 8-10 weeks before transplanting
Earliest Outdoor Planting: Before Last Frost
Can direct seed outdoors
Can seed indoors
Prefers a sunny location in well-drained, rich soil, high in organic matter, with a soil pH of 6.2 to 6.8. Scallions can be direct-seeded, grown from transplants started inside, or from sets -- small bulbs about 1/2 inch in diameter.
Propagate by seed: to grow your own onion sets, sow seeds thickly in a block in midsummer. About 2 months after planting, roll down the tops, forcing the plants to form small bulbs about the size of a dime. After tops dry, clip them off, leaving about 1/2 inch of stem. Cure and store in a cool, dry place; plant your sets the following spring.
Direct-seed in spring when the soil reaches 50 degrees F: plant seed 1/4 inch deep, 1/2 inch apart, in rows 12 to 18 inches apart. When scallion seedlings are established thin to 1 inch spacing.
Sow indoors: start transplants inside about 8 to 10 weeks before last frost date. Plant 4 or 5 seeds in each cell, or seed in flats 1/4 inch deep and 1/2 inch apart. If tops grow too tall and begin to droop, use scissors to trim back to 3 inches tall. After hardening off, transplant 2 to 4 weeks before last frost date. Space 1 inch apart; if bulbs are larger, space a little further apart.
From sets: choose bulbs no larger than 3/4 inch in diameter to plant 3 to 4 weeks before last frost date. Place about 1 inch deep and 4 inches apart for large bulbs or 2 inches apart for smaller bulbs.
Requires plentiful, even moisture for good yields; water weekly if weather is dry. Mulch to retain moisture and suppress weeds.
Harvesting and Storing Scallion
Harvest scallions when the tops are about 6 inches tall; the younger they are the milder their flavor tastes. Loosen the soil around each bulb and pull or dig it up carefully; damaged onions do not store very long. Spread the harvested scallions on a flat surface; leave them until the skins are dry and the tops have withered completely (2 to 10 days outside; 2 weeks indoors). Cut off the tops, leaving about an inch of stem, and store the bulbs in mesh bags in a cool, dry, well-ventilated location until used.
Scallion Insect and Disease Information
Minimize onion maggot damage by using floating row covers to help prevent infestations. Purple blotch and leaf blight diseases can be controlled by eliminating too much moisture. Avoid wetting foliage and water early in the day so the leaves dry as quickly as possible. Proper plant spacing minimizes crowding and allows better air circulation. Eliminating weeds from around plants and garden area also improves air flow. Clean up all fallen or diseased leaves and stems in the fall.
Scallion Yield Information
No yield information for Scallion.
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