Onion White Sweet Spanish
Best long-day onion variety for home gardeners and fresh market growers.
Discover the White Sweet Spanish Onion, a versatile and adaptable variety perfect for fresh markets. Its attractive glistening white skin covers mild flesh, making it ideal for both raw and cooked dishes. These long-day onions can be harvested early as scallions or matured for sale and short-term storage, requiring 14-16 hours of daylight for bulb development. Each seed packet provides a strong start for your garden or commercial venture, yielding approximately 50-60 transplants.
$9.69
Owner Satisfaction
4.6
/ 5
Category Rank
3177
/ 6090
#3177 in Seeds & Seed Tape
Price vs Category Average
-9%
Below average
Daylength
1416
/ Long Day (requires - hours)
Who it's for
- Home cooks seeking mild, crisp onions for fresh salads
- Gardeners aiming for maximum harvest volume per plant
- Preservationists wanting sweet onions that last through the winter
Who should skip it
- Southern growers living in regions with shorter daylight hours
- Gardeners in humid climates prone to fungal rot
- Chefs requiring a bold, pungent onion flavor for cooking
Performance breakdown
Harvest Flexibility
Adaptable growth allows for early scallion harvest or full bulb maturity.
Regional Suitability
Strict long-day requirement limits success to northern latitude growing zones.
Germination Reliability
Consistent seven to twelve day window provides a predictable garden start.
Market Appeal
Glistening white skin finish ensures high visual impact for fresh sales.
Storage Potential
Best suited for immediate consumption rather than extended winter pantry storage.
Culinary Versatility
Mild flavor profile excels in both raw salads and cooked dishes.
Key Specs
Daylength
Long Day (requires 14-16 hours)
Plants
50-60 transplants/count
Soil Temperature
60-65°F
Germination Days
7-12 Days
Seeding Depth
0.25-0.5"
Maturation Days
120 Days
Planting Method
Transplant
Spacing in Row
2-4"
Features
- Uniform, widely adapted Sweet Spanish type
- Glistening white skin finish
- Mild flesh for raw or cooked use
- Harvestable as scallions
- Popular for fresh markets
- Available treated or untreated
- Long day requirement for bulb formation
What customers say
Customers overwhelmingly praise the Harris Seeds White Sweet Spanish onion seeds for their exceptional viability and robust performance. The germination rate is consistently reported as high, building immediate gardener confidence. Users confirm the resulting onions are true to type, producing large bulbs with the expected mild, sweet flavor perfect for fresh eating. Seedling vigor is noted, allowing for successful transplanting and quick establishment. While the seeds deliver excellent yield and superior flavor, some newer growers face minor bulbing challenges related to timing. Overall, this variety is considered a reliable, high value choice that consistently delivers quality harvests for home and small scale growers.
Know before you buy
Long-day onions require 14 to 16 hours of daylight to trigger bulb formation. Because of this specific requirement, they are best suited for northern regions where summer days provide enough light to reach maturity.
Yes, you can harvest them early as scallions if you prefer a milder, younger onion. If you want full-sized bulbs, you should allow them to reach their 120-day maturity window.
This variety is specifically intended for transplanting. You should start your seeds indoors and move them to the garden once they are established to ensure the best success rate.
For optimal bulb development, space your transplants 2 to 4 inches apart in the row. This provides enough room for the bulbs to size up properly without overcrowding.
The White Sweet Spanish is primarily a fresh-market variety, meaning it is best suited for immediate use or short-term storage. It does not have the long-term storage capabilities of some pungent storage onion varieties.
For the best germination results, aim for a soil temperature between 60-65°F. At this temperature, you can typically expect to see sprouts within 7 to 12 days.
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