‘Rainbow Trio’ Long Keeping Onion Seeds

One packet yields three different colored, widely adapted, intermediate day length onions. These high-yielding, long keeping varieties include: brilliant red Cherry Mountain and golden-bronze Saffron F1 Grano types, and silvery Diamond Swan F1. All three of these powerhouse hybrids germinate quickly and grow strongly, producing heavy early yields of firm big, crunchy bulbs with shiny, papery wrapper skins. These onions store well and are endlessly versatile for salads, sautés, stews, soups, and casseroles. Check out our Onion Growing Guide for more information.

Variety Details

• Plant type: Biennial
• Growth habit: Herbaceous
• Crop category: Onion
• Product format: Seed packet
• Plant family: Amaryllidaceae (Alliums)

Sowing & Growing

• Light: Full Sun
• Planting season: Fall or Spring
• Starting location: Direct Sow or Start Indoors & Transplant

Sow ‘Rainbow Trio’ Long Keeping Onion according to the local cool-season window and the recorded starting method. Give seedlings strong light when started indoors, then transplant or thin them to the listed spacing. Keep weeds from competing with the narrow foliage and evaluate soil moisture at root depth rather than using a universal schedule. Harvest leaves, stems, or mature bulbs according to the crop type. For storage types, allow curing after the neck and outer layers reach an appropriate stage.

Before sowing ‘Rainbow Trio’ Long Keeping Onion, review the packet alongside the current product details and note any range in temperature, germination, or maturity. Ranges reflect biological and seasonal variation rather than a fixed promise. Label each planting with its date and location, then compare emergence, growth, and harvest with local weather. This record is useful for succession plantings and for deciding whether the crop fits better into an earlier or later seasonal window.

Explore related options in our Onion Growing Guide.