A Quality-First Approach to Onions
Syngenta’s onion breeding program draws on germplasm from around the world, testing varieties across a wide range of environments to help ensure that what reaches growers has been refined for both agronomic performance and marketable quality. Our onion portfolio is developed to meet the specific demands of growers here in the US: high single-center percentages, strong skin quality, and dependable bulb shape.
The result is a portfolio built to perform in the field and help hold up through packout, with the adaptability to succeed across growing regions, from the California's Central Valley to the East.
Explore Syngenta's Onion Portfolio
Three varieties, each bred to meet a different need in the field, and consistently deliver quality and high yield potential.
Roundo
Roundo is an early season, long-day yellow onion with exceptional reliability and adaptability. Its ideal agronomic traits and premium globe-shaped bulbs give West Coast growers a dependable start to the season.
Variety Specs
- Type: Yellow | Shape: Globe | Size: Colossal
- Maturity: 105 days | Day Length: Long-day
- Suitable for: Fresh Market, Processing
Olympo
Olympo delivers premium quality and consistent performance for fresh market growers. Its exceptional skin quality and thin necks give growers a dependable main-season white onion with strong packout potential.
Variety Specs
- Type: White | Shape: Globe | Size: Jumbo
- Maturity: 125 days | Day Length: Long-day
- Suitable for: Fresh Market, Processing
Darko
Darko is a long-day onion with unique dark red/violet skin and a jumbo, globe-shaped bulb. Its vigorous plant and high tolerance to field stress make it a reliable choice for growers who need long storability and mechanical harvesting suitability.
Variety Specs
- Type: Red | Shape: Globe | Size: Jumbo
- Maturity: 130 days | Day Length: Long-day
- Suitable for: Fresh Market, Processing, Bunching
Inside Syngenta’s Onion Breeding Program
The most important qualities that we breed for in onions are shape uniformity, and we're also breeding for single centers and storability.”
– Miguel Guillén, Product Specialist, Western United States
Syngenta Vegetable Seeds
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© 2026 Syngenta. Some or all of the varieties may be protected under one or more of the following: Plant Variety Protection, United States Plant Patents and/or Utility Patents and may not be propagated or reproduced without authorization. The trademarks or service marks displayed or otherwise used herein are the property of a Syngenta Group Company. All other trademarks are the property of their respective third-party owners.