Sweet Agent Onion

$4.99

Sweet Agent Onion is a hybrid, short-day variety that produces colossal, flattened sweet onions. Uniform and early-maturing. Allium cepa. 110 days to maturity.

250 seeds per packet

Availability: In stock

Sweet Agent Onion is a hybrid, short-day onion that produces huge, flattened sweet onions. This is your prototypical “Vidalia” type sweet onion that has a grand or flattened shape. Sweet Agent is known for it’s uniformity and jumbo to colossal size. Upon curing, these onions have a beautiful brown color.

Sweet Agent Onion can be direct-seeded or transplanted, although we recommend transplanting. For direct-seeding, plant seeds 2″ apart along the row with a row spacing of 24″. Once seedlings emerge, thin seedlings to a 6″ plant spacing along the row. Sterling Onion seeds can be planted with our Hoss Garden Seeder. We recommend using a #1 seed plate and modifying the hole size slightly to accommodate the onion variety being planted. For denser plantings, more holes may need to be drilled to accommodate a thicker spacing.

For transplanting, plant one seed per cell in our heavy-duty seed starting trays. Once the green stems reach 6-8″ in length and/or they can be easily pulled from the seed trays, the transplants are ready to go in the ground. Transplant onions 4-6″ apart along the row with a row spacing of 24″. If drip irrigation is used, onions may be planted on double rows with drip irrigation in the middle. We suggest burying the drip tape 3-4″ deep and planting on both sides of the tape.

Onions are heavy feeders and will require significant nutrient inputs throughout their lifespan. We recommend feeding them with our 20-20-20 and Ammonium Sulfate fertilizers. Fertilize with 20-20-20 shortly after transplanting. The phosphorous and potassium in the 20-20-20 fertilizer will help to promote solid root development, while the nitrogen will promote vegetative growth. Once transplants are established, we recommend side-dressing or injecting with our Ammonium Sulfate fertilizer.  Side dress or inject 1 cup per 20 feet of linear row every 3-4 weeks after transplanting.

Sweet Agent Onion Planting Information

Planting Method: transplant

When to Plant: early spring

Planting Depth: 1/4″

Seed Spacing: 4″

Row Spacing: 12-18″

Days to Maturity: 110

Disease Resistance: None

All search results
Scroll to Top

Subscribe to Our E-Newsletter and Get a Free Garden Planner with Your First Order

Shipping Info

For the contiguous 48 United States:

Orders less than $49:
$4.99

Orders between $49 – $99:
$7.99

Orders more than $99:
FREE

For Alaska and Hawaii, select your state on the following checkout page for a shipping quote.