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Spanish Yellow Onion
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Spanish Yellow Onion is a classic, easy-to-store kitchen staple that brings fresh flavor right to your kitchen.
Simply start indoors or direct sow at the right time for your zone and enjoy a rewarding harvest with very little fuss.
Spanish Yellow Onions are a long-day variety, meaning they need 14+ hours of daylight to bulb up, making them ideal for gardens in the northern half of the United States.
Grow Onion at home and consider using it in Caramelized Onion Soup.
🌱 Spanish Yellow Onion Growing Guide
Get all of the growing information you need for your Spanish Yellow Onion with Bella Garden Seeds Growing Guides!
Bella Garden Seeds Growing guides are based on details provided by our botanist to answer your questions and set you up for success. If you have additional questions, email us at hello@bellagardenseeds.com to get the help you need.
Spanish Yellow Onion is a long-day bulb onion that produces large, mild yellow bulbs perfect for storage. It thrives in northern gardens where summer days reach 14+ hours.
🌿 Spanish Yellow Onion Quick Facts
- 🌱 Type: Long-Day Bulb Onion
- ⏳ Days to Harvest: 100-110 days
- ☀️ Sun: Full sun
- 🌡️ Best Temperature: Cool start (50–60°F), warm finish
- 🪴 Container Friendly: Limited, needs deep pots
🌎 USDA Growing Zones
Spanish Yellow Onion is best suited to USDA zones 3 to 7, where summer day length reaches 14 or more hours. Gardeners in southern zones may struggle to size up bulbs and should consider a short-day variety instead.
🌱 When to Plant
Start seeds indoors 8–10 weeks before the last spring frost, or direct sow as soon as the soil can be worked. Transplant seedlings outdoors 4–6 weeks before the last frost when they're about pencil-thick.
📐 Spacing
Plant seeds 1/4 inch deep. Transplant or thin seedlings to 4–6 inches apart in rows 12–18 inches apart. Generous spacing helps bulbs size up.
💧 Watering
Keep soil consistently moist through bulb formation. An inch of water per week is the general guideline. Reduce watering as tops begin to fall over to help cure bulbs in the ground.
🌾 Harvesting & Curing
Harvest when 50–75% of the tops have fallen over and yellowed. Pull the onions and cure them in a warm, dry, well-ventilated spot for 2–3 weeks until the necks are completely dry. Properly cured Spanish Yellow Onion bulbs store 4–6 months in a cool dry place.
This was my first time growing tomatoes and these grew well. The growing guide was really helpful. Making sauce with my own tomatoes felt like a big deal.
Bought this and it was the perfect starting point. The mix meant something was always growing. So much fun. Thank you
