The Yellow Sweet Spanish Onion is a large, globe-shaped onion variety prized for its mild, sweet flavor and crisp texture. Perfect for fresh salads, cooking, or caramelizing, these onions are a versatile kitchen staple. Known for their impressive size, they can grow up to 4 inches in diameter under optimal conditions. This long-day variety thrives in regions with extended daylight hours and produces golden-yellow bulbs with a papery skin that stores well for several months. Ideal for home gardens, they’re a favorite among gardeners for their reliable growth and delicious taste.
Transplanting Seedlings:
- Timing: Transplant Yellow Sweet Spanish Onion seedlings outdoors when the soil is workable and the risk of frost has passed. Onions are cold-tolerant and can be planted in early spring as soon as the ground can be prepared.
- Preparation: Select a sunny location with loose, well-draining soil. Work in compost or aged organic matter to enrich the soil. Onions prefer slightly acidic to neutral pH soil (6.0-7.0).
- Separating Seedlings: Gently remove the clump of approximately 20 seedlings from the pot. Soak the root ball in water for a few minutes to loosen the soil. Carefully tease apart the individual seedlings, taking care not to damage the delicate roots.
- Spacing: Space individual seedlings 4-6 inches apart, with rows 12-18 inches apart, to allow ample room for bulb development and airflow.
- Planting Depth: Plant each seedling so that only the white portion of the stem is buried, leaving the green tops exposed. Ensure the roots are well-covered with soil and the seedlings are upright.
- Watering: Water thoroughly after transplanting to help the roots establish. Maintain consistent moisture during the growing season, especially during dry spells, as onions prefer evenly moist soil.
- Mulching: Apply a thin layer of organic mulch to conserve soil moisture, suppress weeds, and regulate soil temperature. Avoid heavy mulching, as onions need good airflow around the bulbs.
- Feeding: Fertilize with a nitrogen-rich fertilizer every 2-3 weeks during the early growing stage to promote healthy foliage, which supports bulb growth. Switch to a balanced fertilizer as the bulbs start to form.
Growing: Onions need moisture especially in their first several weeks of growth, and they cannot fight against weeds; mulching onions can help with both moisture and weed control. Sweet Spanish Yellow onions tolerate mildew.
Harvesting: When the tops of the onions turn yellow or flop over, they have matured and are ready to be harvested. Pull them from the earth, brush off the dirt, and leave them to cure in the sun for a week. If the weather turns rainy, bring them inside to cure in a dry, well ventilated place. When the skin dries, cut the tops down to 1″ and trim the roots. Store in a cool, dry place. Sweet Spanish onions do not store well for long periods of time.
Latin Name: Allium cepa
Type: Open Pollinated, Heirloom, Cool Season|Warm Season
USDA Zones: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
Planting Method: From Transplant
Sunlight: Full Sun
Height: 24 Inches
Color: Yellow
Reviews
There are no reviews yet.