Allium cepa
Evergreen White Bunching Nebuka Onions (65-120 days)
Also called Nebuka onions.
Fantastic for green onions. Evergreen White produces clusters of 5-9 long, tall, crisp, silvery white stalks.
Amazing flavor for a non-bulbing onion that is slow to go to seed. Good for spring or fall planting.
TIP: Plant them first in planting trays (redwood box, old cat box, whatever) and then transplant them to the garden when they are about 1/2 the size of a pencil. In this way you can eliminate weed competition that always happens when you plant such a tiny seed. It also makes them very easy to use as a border planting. Many pest do not like onions and may not cross the border. So not only do you save space, but you create natural barriers. Note: When companion planting, do not plant onions next to beans or legumes of any type.
Texas A&M says...
"They are cold resistant and can be grown during winter. They will not bulb and are harvested as needed, using both the root and the tops."