Many cooks will tell you that onions are the foundation of any good meal. At Adaptive Seeds, we are happy to offer unique varieties that offer great culinary and agronomic traits.

Onions are often day length sensitive and many varieties will only produce bulbs when grown at the appropriate latitude. Most of the onions we offer were sourced from northern latitudes and are listed as Long Day onions. Long Day onions grow best north of 37˚N (or south of 37˚S).

Our location in Oregon is at about 44˚N. We know the varieties we sell grow well at our location, but the truth is that we don’t know how well they grow farther south because we don’t have the resources to trial them at other latitudes. If you are a southern grower who has had success (or failure!) with our onion varieties, please help us and other potential growers by writing a review on the product page.

We offer two onion varieties that are Intermediate Day or Day Neutral, meaning they will produce bulbs no matter where they are grown. If you are a southern grower, we recommend Sweet Spanish Colorado #6 and Gold Princess.

We do not grow or sell any Short Day onions.

Showing all 15 results

  • Polyvit Chives

    Chives, Polyvit (Organic)


    Allium schoenoprasum. Perennial in zones 3-10. Produces bunches of dark green, pungent, onion flavored leaves that are very versatile in the kitchen. Plants grow to about 12″ tall. Very hardy plants withstand neglect, can grow in full sun to part shade, and are great for containers. In midsummer, plants produce little, light purple, globeshaped flowers…

  • Organic Green Onion Ton Hom Nuan seed
    Organic Green Onion Ton Hom Nuan seed

    Green Onion, Ton Hom Nuan (Organic)


    Allium fistulosum. Green Onion / Scallion. 65 days. A unique bunching onion from Thailand. Ton Hom Nuan green onion surprised us in its ability to produce tons of small green onions that are perfect for soups, stir frying, and sprinkling into salads. Unlike many Japanese negi type bunching onions, Ton Hom Nuan tend to hold…

  • Organic White Spear Green Onion Seed

    Green Onion, White Spear (Organic)


    Allium fistulosum. Green Onion / Scallion. 60 days. Andrew’s favorite green onion! Dependably produces beautiful bunches of green onions. Upright growth with no flopping, vigorous and easy to clean. So perfect that you don’t even need to cut the tops off. Bright green leaves and white bottoms are tall yet stocky. We have been selecting…

  • Onion-Cipolla-di-Rovato

    Onion, Cipolla di Rovato (Organic)


    Allium cepa. Yellow Storage. 110 days. Long Day. Gorgeous, golden cipollini type onion originating in Italy with a classic flat / disc shape. More mild in flavor than our other yellow storage onions. Bulbs range from 2-3” across; smaller bulbs are nice, dense and good for pickling. Definitely a delicious all-purpose onion. Surprised us with…

  • Fehmel-Steig Onion

    Onion, Fehmel-Steig (Organic)


    Allium cepa. Yellow Storage. 100 days. Long Day. A pungent, yellow storage onion reportedly from Rheinland in Germany. Long day, storage type that stores well for over 6 months. Excelled in our 2016 trials of 12 varieties of storage onions, showing good uniformity of shape with hardly any doubles. Vigorous plants have leaves with unusually…

  • Onion, Franzisco (Organic)


    Allium cepa. Yellow Storage. 105 days. Long Day. Long day yellow storage onion that consistently performs well in our trials. Reliably produces perfectly round 5” bulbs with tight wrappers perfect for extended storage. Franzisco is famous for its high yield potential and strong root systems that are resilient under many growing conditions including dry farming….

  • Onion, Gold Princess

    Onion, Gold Princess (Organic)


    Allium cepa. Yellow. 85 days. Day Neutral. Very early maturing globe onion that matures weeks earlier than every other variety of onion we grow. The multi-purpose Gold Princess is commonly planted very close together and picked small for pickling, or for little fresh pearl onions, but we prefer to grow it like a normal onion,…

  • Organic Karmen Onion Seeds

    Onion, Karmen (Organic)


    Allium cepa. Red Storage. 100 days. Long Day. One of the best open pollinated red onions available. Medium-early and uniform. Dark red skin with good red color through all of the bulb layers. Known as a good storage type and we have certainly seen this to be true. Medium sweet flavor. It grows very well…

  • Lilia Onion
    Out of Stock

    Onion, Lilia (Organic)


    Allium cepa. Red Scallion/Onion. 40 days bunching, 90 days bulb. A beautiful, red scallion / salad / spring onion with tall, dark green tops. Red color develops early. Flavor is not as pungent as one would expect for a red onion; its mildness is well-suited for raw/fresh use. Bright red/purple color is very pretty in…

  • Organic Maria Nagy's Transylvanian Red Onion SeedOnion, Maria Nagy's Transylvanian Red (Organic)

    Onion, Maria Nagy’s Transylvanian Red (Organic)


    Allium cepa. Red Storage. 100 days. Long Day. A landrace red storage onion from a region of Transylvania that is famous for its storage onion production. Onions measure 3-4” across, produce well even with low fertility and water inputs, and store well through the following spring. Maria Nagy was one of the few subsistence farmers…

  • Maria Nagy's Transylvanian Yellow Onion Organic Seed

    Onion, Maria Nagy’s Transylvanian Yellow (Organic)


    Allium cepa. Yellow Storage. 100 days. Long Day. But of course every homestead farm also needs yellow onions! Our favorite Romanian seed steward, Maria Nagy, shared her yellow onion with us as well. Maria Nagy’s Transylvanian Yellow is very similar in appearance to the red strain (except, obviously, yellow) with 3- 4” bulbs and some…

  • Onion, Newburg (Organic)


    Allium cepa. Yellow Storage. 110 days. Long Day. Simply the best open pollinated yellow storage onion. Originally selected from a European commercial hybrid storage onion, it was reselected under and for organic production. The tightly wrapped, copper-skinned, spherical bulbs are known for their excellent storage life, crisp texture, and medium hot rich flavor. Newburg has…

  • Onion, Rose de Roscoff Keravel (Organic)


    Allium cepa. Pink Storage. 105 days. Long Day. The pretty rosy-pink skin of this onion is not the only thing that sets it apart. Flavor is both delicately sweet and piquant, complex yet not overpowering. White flesh with light pink layers. Good for braiding and long storage. Rose de Roscoff Keravel is a selection of…

  • Onion, Rossa di Toscana (Organic)


    Allium cepa. Red. 120 days. Long Day. These beautiful, dark red Italian onions can get very large and still maintain good storage quality through February. Classic flattened cipollini shape. White and red layered flesh is very pungent. Strong necks are good for braiding. Studies conducted at the University of Perugia’s Department of Pharmaceutical Sciences showed…

  • Organic Sweet Spanish Colorado No. 6 Onion Seed

    Onion, Sweet Spanish Colorado #6 (Organic)


    Allium cepa. Yellow Sweet. 100 days. Day Neutral. A lovely sweet onion with bronze skin and good storability, first released in 1936 by the Colorado State University Experiment Station in Rocky Ford. Sweet Spanish Colorado #6 stood out in our sweet onion trials first for its agronomic traits, and later for its delicious sweet onion…