PRE-ORDER NOW! SHIPS SEPT. 2024 - Spanish Globe Onion Sets (Bulbs)


Available Now!






Pre-order now for the freshest bulbs! Estimated to arrive mid-September 2024, we will begin shipping as soon as they are available.


Spanish Globe Onion Sets are a great choice for gardeners who want tasty green onions early in the growing season and storage onions later in the summer. Spanish Globe is crisp and sweet in the form of 3-5 inch diameter onions with golden-yellow skin, yellow-white flesh, and round shape at maturity. Excellent long-day onions for Northerners, forming large bulbs when daylight lasts 14-16 hours. Excellent for storage and growing in tight spaces. Onions sets are extremely quick, producing mild-tasting green onions in 2-4 weeks.

About Onion Sets or Bulbs: Onion sets are small starter bulbs specifically for gardening. Onion sets are reliable and easy to grow, they are establish quickly, and are easy to plant compared to seeds or transplants. Plant in Fall or early Spring for a harvest in late Summer.

Also Known As: Long Day Onions

We ship in 1 business day. Shipped with USPS First Class Mail.

Plant Name:
Onion, Spanish Globe (Long Day)
Latin Name:
Allium cepa
Days to Germinate: 7-14
Days to Harvest: 90 (Plant Spring/Summer), 240 (Plant Fall/Winter)
Growth Habit: Root, Long Day
USDA Zones: 3-10
Lifespan: Biennial
Brand: TomorrowSeeds
Sunlight: Full Sun, Partial Shade
Heirloom, Open-Pollinated
Fungicide-Treated Seeds*: No
Seeds Packed For**: 2025

*Fungicide-treated seeds protect the seedlings from diseases until they are up and growing. Do not eat treated seeds.
**Seeds are freshly packed for the growing season of the year listed. Seeds are still viable beyond pack date. Store in a cool and dry location such as the refrigerator or basement to best preserve germination rates.

Planting Instructions:


Soil Preparation and Fertilizing:

Choose an area with well-draining soil and receives full sunlight each day. When it is dry enough to not stick to garden tools, work the soil. Before seeding or transplanting, remove all rocks and trash from the soil, then dig or plow the soil 8-10 inches deep and rake up several times to break up large clods.  At this point, you may optionally spread 2-3 pounds of a complete fertilizer per 100-square-feet of garden area.  Measure and spread the fertilizer, then mix it with the top 3-4 inches of soil. Rake until smooth.  Tip: If you live in an area with heavy clay or hard soil, add a 1 inch layer of compost to improve soil texture.


Onions are a cool-season crop and can stand temperatures well below freezing. They may be planted from seeds, from small bulbs called sets, or from transplants. Seeding costs the least but takes longer before onions are ready.  

When using sets or transplants, plant October-February (for biggest bulbs in May/July harvest). Plant onion sets with the point end up 3/4 inch deep and 3 inches apart. Try not to transplant onions more than 1 inch deep. As the cold chill of winter arrives, the onion plants go dormant. Then, as the temperatures and soil warm again in early spring, the onions come back to life.


Planting Depth: 3/4 inch
Within-Row Spacing:
3 inch
Between-Row Spacing:
1- 2 feet


Care During the Season:

Watering: Watering once a week is usually enough in the Spring. You may need to water more often during dry, windy weather. Slow, deep watering helps the root system grow strong. 
Weeding and Pruning: Weeds are easy to pull or cut when they are 3-4 inches tall. Try not to let weeds or grasses grow large because they will compete with onions for nutrients. If hoeing to remove weeds, be careful not to cut too deeply  as cutting the feeder rooters may slow the plant's growth. It is better to pull by hand when possible.

Fertilizing: When the onion plants have 5-6 leaves, you may optionally apply fertilizer again to help grow larger plants and bigger bulbs. Each leaf forms a ring in the onion bulb. More leaves means more rings and larger bulbs. Use about 1/2 cup of fertilizer for each 10 feet of onion row. Scatter the fertilizer evenly between the rows around the plants. Then water the onions after adding the fertilizer. 
Insecticides: Onions have few insect problems. However, thrips, which are very tiny insects, may be found between the center leaves. Many Insecticides are available in garden centers for use if needed. Bt-based insecticides and sulfur are organic options that can be used. Sevin is a synthetic insecticide option. Before using a pesticide, please read the label and always follow cautions, warnings and directions.

Diseases: Diseases may be problem on onions. Brown leaf tips or brown spots on the middle and lower parts of leaves may be caused by plant diseases. Sulfur has fungicidal properties than can help control many diseases. Neem oil and other fungicides are available for use. Please always follow cautions, warnings, and directions.


Onions set/transplanted in January/February should produce bulbs in May/July. If used as green onions, they may be picked from the time they are pencil size until they begin to form bulbs. For dry-bulb onions, let the plants grow larger. The onions are ready when the main stem begins to get weak and fall over. Pull the plants out of the soil. Leave them lying in the garden for about 1-2 days to dry. Then remove the tops and roots and let them keep drying in baskets or boxes. Onions can be stored in a refrigerator crisper or in a dry, airy place such as a in a wire net in the garage or carport.


Nutrition Facts:

Calories 44
% Daily Value*
Total Fat 0.1 g 0%
Saturated fat 0 g 0%
Polyunsaturated fat 0 g
Monounsaturated fat 0 g
Cholesterol 0 mg 0%
Sodium 4 mg 0%
Potassium 161 mg 4%
Total Carbohydrate 10 g 3%
Dietary fiber 1.9 g 7%
Sugar 4.7 g
Protein 1.2 g 2%
Vitamin A 0% Vitamin C 13%
Calcium 2% Iron 1%
Vitamin D 0% Vitamin B-6 5%
Cobalamin 0% Magnesium 2%
*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.