Plethora Onion
Plethora Onion is a short-day onion variety that produces massive, jumbo sweet onions. Yellow with granex (slightly flattened) shape. Performs well when planted in fall and overwintered. Allium cepa. 180 days to maturity. Treated.
250 seeds per packet
Description
Be sure to check out our Onion Growing Guide for helpful tips & tricks on how to successfully grow onions in your garden.
Plethora Onion is a short-day, yellow onion that performs well in the southern states. This sweet onion variety produces yellow, granex-style onions that are slightly flattened. Plethora onions are huge! This variety produces jumbo, colossal onions that are easily larger than a softball. These perform best when planted in the fall and overwintered. If your winter temps are rarely below 20 degrees, this is the preferred growing method.
Plethora 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. Plethora 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.
Plethora 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: 180
Disease Resistance: None
Onion Planting Guide
Select an onion variety based on your geographical location. In many cases, intermediate-day varieties can be grown in southern long-day regions and northern short-day regions.
Short-day Onions
- Plant in fall and overwinter for a spring harvest
- Start the bulbing process when day length reaches 10-12 hours
Intermediate-day Onions
- Plant in late winter for an early summer harvest
- Start the bulbing process when day length reaches 12-14 hours
Long-day Onions
- Plant in spring for a mid-summer harvest
- Start the bulbing process when day length reaches 14-16 hours