Long Day Onion Seeds – Non-GMO Heirloom

The sweet, long-day onions worth a spot in your northern garden

Long day onions are the classic bulbing onions of the northern United States, the ones that wait for the long days of early summer before they start to swell. The varieties here lean sweet and mild: Walla Walla, prized for its juicy, gentle flavor; the pale White and golden Yellow Sweet Spanish for big, all-purpose bulbs; and Eclipse for reliable, uniform onions. Grown where summer days run long, they reward you with full-sized onions that slice sweet and store well through the cold months.

How to grow long day onions from seed

Long day onions need a head start, so most northern gardeners sow the seed indoors 8 to 12 weeks before the last spring frost, then transplant the young plants out as soon as the soil can be worked. Give them full sun, loose, fertile soil, and steady moisture, and keep them weed-free while the bulbs size up. They bulb when daylight reaches roughly 14 to 16 hours, which is why they suit the northern half of the country. Each variety here has its own step-by-step guide: see our Walla Walla, White Sweet Spanish, Yellow Sweet Spanish, and Eclipse onion growing guides for depth, spacing, and harvest timing.

How to use long day onions

These are everyday cooking onions with a sweet streak. The Sweet Spanish types and Walla Walla are mild enough to eat raw, sliced thin over burgers, salads, and sandwiches, while any of them caramelize beautifully, roast down sweet, and give body to soups, stocks, and sauces. Well-cured bulbs keep for months in a cool, dry, dark spot, so a summer harvest carries your kitchen through fall and winter.

Long day onions and their allium cousins

If you are growing onions, round out the allium patch with the rest of the family. Browse the full Onion Seeds collection for bunching onions, reds, and scallions, or try Short Day Onion Seeds if you garden in the warm southern half of the country. Explore the whole range in our Vegetable Seeds collection.

Why buy long day onion seeds from Organo Republic

Every packet of onion seed we sell is non-GMO, open-pollinated heirloom, and germination tested, so you can sow with confidence. As a U.S.-based licensed seed dealer, we work directly with trusted growers to keep quality high and prices low, and every pack carries a QR code that links straight to free online growing guidance. Orders over $49 ship free. Whether you want a single pack of Walla Walla or a full onion patch, you will find dependable, easy-to-grow seed here.