VegetableOnion
Spanish Yellow Onion
Spanish Yellow Onion is a long-day bulbing variety that produces round, bronze-skinned bulbs with impressive storage longevity. Known also as Sturon Yellow Onion, this open-pollinated annual thrives in zones 3 through 9 and reaches harvest maturity in 100 to 109 days. Plant it in full sun with 3 inches of spacing between sets, and you'll harvest substantial yields of reliable, keeping onions that outperform many modern varieties.
Photo © True Leaf Market
Growing Conditions
USDA Zone
3-9
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Fertile Loam, Moderately Rich
Growth Stats
36 in
Height
TypeUpright
Spacing
3
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
3-9
Size
36in H x ?in W
Growth
—
Care
High
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Highlights
These bronze-skinned bulbs are built for the long haul, storing exceptionally well without losing quality or flavor. The variety's reputation rests on consistent, high yields of uniform round bulbs that handle cool-season growth in northern gardens and warm-season cultivation in the South. Open-pollinated genetics mean you can save seed year after year, connecting you to a living tradition of onion cultivation that stretches back generations.
Common Uses
Spanish Yellow Onion serves as a foundational cooking onion, suited to any application where a reliable, sweet yellow onion adds depth to a dish. Use it for caramelizing, roasting, soups, stews, and everyday culinary needs. The excellent storage quality means you can preserve your harvest through fall and winter, making it invaluable for gardeners who want to eat from their own supply year-round rather than shopping for onions months after harvest.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Transplant Outdoors
Transplant onion sets outdoors after the last frost date when soil temperatures have warmed sufficiently for root establishment. Space sets 3 inches apart in rows 18 inches apart, planting pointy end up with the tip just below the soil surface. Sets can go in as soon as soil is workable in spring.
Harvesting
Harvest Spanish Yellow Onions when the tops begin to yellow and fall over, typically 100 to 109 days after planting sets. The bronze skin will be fully papery and brittle at maturity. Gently lift or pull bulbs from the soil, brush away excess dirt, and cure them in a warm, dry, well-ventilated space for 2 to 4 weeks before long-term storage. Cured onions should have completely dried, papery outer layers and a solid neck with no soft spots.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Scientific Classification
Allium cepa
Family
Amaryllidaceae
Genus
Allium
Growth Habit
Upright
Native Status
L48 (I)
History & Origin
“Spanish Yellow Onion, also marketed as Sturon Yellow Onion, represents a lineage of long-day onion varieties developed for regions with extended daylight during the growing season. The Sturon name traces to European breeding programs focused on storage quality and yield reliability, creating a variety that balances productivity with the kind of keeping ability that made onions such a crucial winter staple for home and commercial growers. This open-pollinated cultivar has remained in cultivation precisely because it delivers dependably across diverse growing regions and climates.”