Green onions are a hardy vegetable that grow best in cool weather. Green onions (also known as scallions or spring onions) can be grown from spring to fall, and in warmer climates, from fall to spring
Plant green onion seeds directly in the garden as soon as you can work the soil, about 8 weeks before the frost date. Continue planting every two to three weeks for a continuous harvest. You can also plant onion sets, preferably a white variety.
Plant green onion seeds or sets up until 10 weeks before the fall frost date.
If you live in a mild climate with a late or no fall frost date (after Nov 1), you might be able to grow green onions all during the winter.
Soil and Fertilizer
Onions grows best in a rich soil; amend with lots of compost and fertilizer (chemical or organic) at planting and every 3-4 weeks during the season.
Fertilizer: 16-16-8 at planting, 21-0-0 every 3-4 weeks.
Harvest green onions anytime after they reach 6” (15cm). If you cut 1” above the root, it can be replanted to grow more green onions.
- Onions Reference Sheet (Utah Extension Service)