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Allium cepa Spanish Yellow Sweet Onion

Allium cepa Spanish Yellow Sweet Onion is a classic, long-day variety treasured for its massive, globe-shaped bulbs and exceptionally mild, sweet flavor. Growing to about 12 to 18 inches tall with bulbs often reaching softball size (4 to 6 inches in diameter), this variety is a favorite for home vegetable gardens and market growers where impressive size and versatility are key. Unlike pungent storage onions, the Spanish Yellow Sweet offers a delicate texture and sugary profile that makes it versatile for both raw and cooked applications, maturing in late summer for a bountiful harvest.

 

Culinary and Practical Uses

  • The jumbo, thick-walled rings are the industry standard for making fried onion rings and French onion soup due to their high sugar content and mild taste.
  • Excellent for caramelizing or roasting, where the natural sugars brown beautifully, creating a rich, savory-sweet flavor perfect for topping burgers and steaks.
  • While milder than storage types, it has better keeping qualities than many other sweet onions, storing reliably for several months in cool, dry conditions.

 

Characteristics

  • Foliage: Upright, tubular, blue-green leaves (scapes) that are vigorous and sturdy; essential for fueling the rapid expansion of the large bulbs.
  • Growth Habit: Biennial grown as an annual; produces large, uniform, golden-skinned bulbs with crisp, white flesh that lacks the sharp "bite" of standard yellow onions.
  • Flowers: Typically harvested before blooming, but if left to overwinter, it produces tall stalks topped with spherical, white flower umbels attractive to pollinators.
  • Seeds: Harvested after flower heads dry; the small, angular black seeds are vigorous and ideal for starting indoors early to maximize the growing season.

 

Growing Requirements

  • Sun: Thrives in full sun; requires long days (14 to 16 hours of sunlight) to trigger bulb formation, making it ideal for Northern and Transition zones.
  • Soil: Adapts to most soil types but thrives in loose, fertile, well-draining loam rich in organic matter to allow for easy bulb expansion.
  • Water: Requires moderate, consistent watering; keeping soil evenly moist is critical for producing the largest, sweetest bulbs without splitting.
  • Spacing: Plant transplants 4 to 6 inches apart in rows 12 to 18 inches apart to accommodate the large potential size of the mature onions.
  • Maintenance: Keep beds strictly weed-free as onions compete poorly; stop watering when tops fall over to allow bulbs to cure before harvesting.

 

Shipping Info

Spanish Yellow Sweet Onion seeds ship as fresh, high-quality, viable seeds that are carefully packaged for stability and protection from damage during transit. Prompt shipping supports reliable germination and seasonally appropriate planting.

Growing Zones

3a - 9b
Your Growing Zone:
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1
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3
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5
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8
9
10
11

Low Temperature

20°F

High Temperature

90°F

Fragrant

Yes

Polinator Required

No

Polinator Friendly

Yes

Flower Color

Blue Bronze Green White

Growth Rate

Moderate

Soil

Loose, fertile, well-draining soil

Moisture

Moderate

Sun Exposure

Full Sun

Mature Spread

4 - 6 inches

Mature Height

12 - 18 inches

Bloom Period

Summer

Pruning Time

Early Spring

Pet Safe

No

Perennial / Annual

Annual

Evergreen / Deciduous

Deciduous

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Yellow Sweet Spanish Onion Seeds

Allium cepa 'Yellow Sweet Spanish'

Regular price $3.99
Sale price $3.99 Regular price
12 - 18 inches
4 - 6 inches
Moderate
Full Sun
Zones 3a–9b
No

Customer Reviews

Overall rating: 4.7 / 5 from 508 reviews.

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I really am thankful for you taking the time and looking at my original pics and sending me a replacement plant. The replacement arrived with one new closed leaf in great shape. As you can see in the picture, it now has a second new leaf starting. And you can see my original plant looking fine with 2 terrific leaves since its arrival. As our weather has been very pleasant, I plan to pot both very soon. Thank you!

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Customer photo review of Shipping Insurance

They arrived in excellent condition. Planted them about 4 weeks age. They are healthy and blooming.

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Customer photo review of Musa 'Red Dacca' Banana

Beautiful plant. It arrived quickly in excellent condition. I'm very happy with it.

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Store owner replied: Thank you for your wonderful feedback, Thomas! We're so happy to hear your plant arrived quickly and in excellent condition. We're delighted you're enjoying your new plant and truly appreciate your support! 😊

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I am so very impressed with this company! I had bought one of the mini banana trees first, which started dying right after I got it. After contacting the company, they agreed to give me a credit, with which I bought these two honeysuckle plants. Please excuse the weeds & bad fencing. Hopefully these little plants will grow up & cover the fence. I will be working on weeding and continuing to build a flower bed at the base of the fence. Thank you Blossomdale! I look forward to buying more plants in the future.

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Store owner replied: Thank you so much for your kind words and continued support, Victoria! We're glad we could help you find a solution and that you're happy with your honeysuckle plants. We hope they grow beautifully and eventually cover your fence. We look forward to helping you grow your garden! 😊

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I’m going to enjoy seeing it grow

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Store owner replied: Thank you for your review, Linda! We hope you enjoy watching your Alocasia Stingray grow and flourish. We appreciate your support! 😊

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Plant arrived very quickly! Packed and boxed beautiful! Plant was perfect! Will definitely buy from you again!

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Store owner replied: Thank you for your wonderful review, Fleurette! We're delighted your fern arrived lush, green, and ready to hang. We appreciate your support and hope you enjoy your new plant! :)

Customer photo review of Shipping Insurance

My banana plant arrived perfectly protected and ready to plant. Thank you Blossomdale for taking great care of my baby banana plant!!

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Store owner replied: Thank you for your kind words, Suzanne! We're so glad your banana plant arrived safely and was well-protected. We appreciate your trust in Blossomdale! 😊

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Store owner replied: Thank you for your kind review, Donald! We're delighted your fig trees arrived well-packed and in good condition. We appreciate your support and hope they thrive through the winter! :)

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Store owner replied: Thank you for your wonderful review, Diana! We're glad you loved the flowers and appreciated the communication about your replacement options. We look forward to serving you again! :)

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Very healthy and beautiful

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Store owner replied: Thank you for your kind review, Rosetta! We're delighted to hear your plant arrived healthy and beautiful. We appreciate your support! :)

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Customer video review of Lantana 'Dallas Red'

I was very impressed with how well my 18 little lantanas were packed. All looked healthy and I planted them yesterday. It was a little difficult unpacking them but that’s the price I paid for having you pack them so well. I was a little worried when I saw UPS coming to the door with the box slung over the driver’s shoulder despite the fact that the box was marked with an ⬆️ and it said live plants. But all is well. Now if I can just keep them alive.

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Store owner replied: Thank you for your review, Beth! We're glad your plant arrived quickly and is doing much better. We appreciate you choosing Blossomdale! 😊

Customer photo review of Coral Honeysuckle 'Honey Coral'

Lovely little guy-- impossible to find coral honeysuckle at my local nursery for whatever reason. I really appreciate that the Blossomdale staff kept it and nurtured it a little longer so it would be more robust for the trip. Can't wait to put it in the ground and watch it thrive :-) Will order from them again.

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