How to Grow Walla Walla Sweet Onion
Allium cepa
Your complete guide to growing Walla Walla Sweet Onion.
📷 Wikipedia: OnionWhen to Plant Walla Walla Sweet Onion
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | October – September |
| Zone 2 | — | May – July | September |
| Zone 3 | — | May – June | September – October |
| Zone 4 | — | April – June | September – October |
| Zone 5 | — | April – May | August – November |
| Zone 6 | — | April – May | August – November |
| Zone 7 | — | March – May | July – November |
| Zone 8 | — | March – April | July – December |
| Zone 9 | — | February – March | June – December |
| Zone 10 | — | January – March | May – December |
| Zone 11 | — | January – February | April – December |
| Zone 12 | — | January – February | April – December |
| Zone 13 | — | January – February | April – December |
Companion Plants for Walla Walla Sweet Onion
✓ Good companions
Onions deter cabbage moths and flea beetles that commonly damage brassicas
Onions repel cabbage worms, cabbage loopers, and other brassica pests
Onions repel carrot flies while carrots help break up soil for onion bulb development
Shallow-rooted lettuce doesn't compete with onion bulbs and benefits from onion's pest-repelling pro…
Onions deter aphids and other soft-bodied insects that commonly attack pepper plants
Onions repel aphids, black spot fungus, and other rose pests when planted nearby
Onions repel slugs, aphids, and other strawberry pests while not competing for space
Onions deter tomato hornworms and aphids, while tomatoes don't compete for nutrients
✗ Keep away from
Onions can inhibit asparagus spear development and overall plant vigor
Onions can inhibit bean growth and nitrogen fixation, reducing bean yields
Onions stunt pea growth and interfere with their nitrogen-fixing capabilities
Nutrition Facts
Per 100g serving (USDA FoodData Central)
