Walla Walla is a classic heirloom white onion prized for its outstanding sweetness, juiciness, and enormous size. Originating from the Pacific Northwest, it thrives in our coastal BC climate and develops its best flavour when overwintered. Sow seeds in mid-August and allow the plants to establish before winter—sugar content helps the plants survive frost. Harvest large, flavourful bulbs in spring for fresh use. Walla Walla can also be sown in early spring and harvested the same year, though overwintering yields larger, sweeter bulbs. This variety does not store well, so enjoy it fresh in salads, sandwiches, and savoury dishes. Where Can You Grow Walla Walla Onion?Best suited for Zones 3–9, Walla Walla onions prefer full sun, fertile soil, and steady moisture. Great for garden beds or rows with good drainage. History and Historical UsesBrought to the Pacific Northwest by a French soldier in the 1800s, this onion became regionally famous for its exceptionally mild and sweet flavour. It was named after the town of Walla Walla, Washington, and has since become a staple in home and market gardens. Canadian Zone InformationZones 8–9: Sow seeds in mid-August for overwintering and spring harvest.Zones 5–7: Start indoors early in the season and transplant out after last frost.Zones 3–4: Spring sowing recommended; protect seedlings from cold snaps. How to Grow and Harvest Walla Walla OnionPlanting: Sow seeds 1cm (½in) deep in rows 30cm (12in) apart; thin to 10cm (4in).Watering: Keep consistently moist, especially during bulb development.Harvesting: Harvest once tops begin to fall over; cure if needed, but enjoy fresh.Maintenance: Mulch in winter to protect young overwintering plants. Seed Saving Tips for Future SupplyBiennial Crop: Allow second-year plants to flower and set seed.Isolation Distance: Keep 500m away from other onion varieties for purity.Seed Harvesting: Collect dry seed heads and separate seed from chaff.Storage: Store in cool, dark, dry place; seed remains viable for 2–3 years. Certified Organic ByIslands Organics Producers Association (Cert#1962)
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