Red Mountain Storage Onion is a long-keeping red onion bred for serious storage, maturing in 105 days from direct seed. Hardy across zones 3 through 10, this variety produces deep red bulbs with excellent keeping qualities, making it a reliable choice for gardeners who want fresh onions well into winter. Sow directly in spring once soil reaches 50 to 70°F, thin seedlings to 2 inches apart in rows spaced 12 inches wide, and you'll harvest crisp, storage-ready bulbs by late summer.
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Red Mountain Storage Onion earns its name through genuine staying power; these bulbs develop the protective papery skin that transforms raw onions into pantry staples lasting months in cool storage. At 105 days to maturity, it strikes a balance between quick enough for short northern seasons yet long enough to build true bulb size. The red color runs deep, signaling the anthocyanin compounds that make red onions both visually striking and biochemically distinct from their yellow cousins.
Red Mountain Storage Onions work across the kitchen: sliced raw into salads where their color holds and their bite adds sharpness, caramelized slowly for soups and stews where their sweetness deepens over time, or pickled whole for winter condiments. The storage capability means you're not rushed to use them fresh; instead, you can reach into a cool pantry in January and pull out a firm, flavorful onion exactly when you need it.
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Sow up to 10 to 12 seeds in a 4 to 6 inch pot. If seedling tops reach over 5 inches before transplanting, cut them back to 3 inches to encourage stronger root development.
When planting out seedlings, carefully separate them and place each in a shallow trench. Fill the trench around the seedlings and water in well to establish good soil contact.
Direct sow seeds in spring once soil temperature reaches 50 to 70°F. Thin seedlings to the strongest plant when they reach 4 to 5 inches tall.
Harvest Red Mountain Storage Onions after about half the tops have fallen naturally. Push over the remaining upright tops and wait about 1 week before pulling bulbs. Harvest in dry weather; onions harvested in wet conditions cure poorly and may rot in storage. Loosen soil around bulbs to encourage faster drying. Remove any onions that have sent up flower stalks, as these will not store well.
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