Red Marble Onion is an exclusive improved organic strain that produces compact, marble-patterned bulbs ready to harvest in just 75 days from seed. Hardy across zones 3-11, this open-pollinated variety thrives in full sun with moderate watering and consistent soil moisture. What makes it truly special is its behavior during the growing season: the skin doesn't form until 2-3 months in, giving you weeks of tender mini onions that are effortless to wash and prepare fresh from the garden.
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Moderate
3-11
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Moderate
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The magic of Red Marble Onion lies in its extended harvest window. Unlike most onion varieties that demand patience for mature, papery-skinned bulbs, Red Marble gives you delicate, skinless mini onions for the first half of the season, perfect for fresh eating and quick cooking. This compact cultivar fits anywhere in the garden and reaches maturity in just 75 days, making it an efficient choice for gardeners eager to cycle through their beds. The improved organic strain ensures clean, reliable seed that germinates reliably between 50-70°F.
Red Marble Onion excels as a fresh eating onion during its early harvest phase when bulbs are still tender and lack papery skin. Pull bunches whenever you need them and use the delicate mini onions raw in salads, quick-pickled as a bright condiment, or lightly sautéed as a mild, sweet addition to spring dishes. As the season progresses and bulbs mature, they store longer and become suitable for cooking applications.
No timeline data available yet for this variety.
Start seeds indoors 6-8 weeks before your last spring frost at a soil temperature of 50-70°F. Sow seeds shallowly in seed trays and keep the soil consistently moist. Transplant seedlings outdoors once they've developed 2-3 leaves and the soil has warmed.
Transplant seedlings outdoors after the last frost date once soil is workable. Harden off seedlings over 7-10 days by gradually exposing them to outdoor conditions. Space plants 4-5 inches apart in rows, choosing a location with full sun exposure.
Direct sow seeds outdoors after the last spring frost. Plant seeds shallowly into prepared, weed-free soil and keep the bed consistently moist until germination occurs.
Red Marble Onion offers two harvest windows. Pull bulbs by the bunch whenever you need tender mini onions during the first 2-3 months of the season, when skin hasn't yet formed and the onions are delicate and easy to wash. As the season progresses and papery skin begins to develop, you can either continue harvesting or allow bulbs to mature fully. For storage onions, wait until foliage yellows and falls over naturally, then pull and cure.
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