Cortland Onion Seeds (Organic)

Cortland Onion is a reliable and flavorful variety known for its large, golden-yellow bulbs and excellent storage qualities. These onions have a sweet, mild flavor and a crisp texture, making them perfect for fresh eating, slicing, or cooking into a wide range of dishes. Thriving in full sun and well-draining soil, Cortland Onions mature in about 100-110 days, producing uniform bulbs that are easy to harvest. The sturdy bulbs store well for several months, allowing you to enjoy their sweet flavor long after the growing season ends.

Variety Details

• Botanical name: Allium cepa
• Plant type: Biennial
• Growth habit: Herbaceous
• Crop category: Onion
• Kitchen profile: Cortland Onion is a reliable and flavorful variety known for its large, golden-yellow bulbs and excellent storage qualities.
• Product format: Seed packet with a separately listed bulk option

Sowing & Growing

• Soil Temperature: 65-85°F
• Planting Depth: 1/4"-1/2"
• Germination: 4-10 Days
• Height At Maturity: 2'-3'
• Days to Maturity: 105-110 Days
• Sun/Shade: Full Sun
• Spacing After Thinning: 4"-6"

Sow Cortland 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.

The sturdy bulbs store well for several months, allowing you to enjoy their sweet flavor long after the growing season ends.

Cortland Onions perform well in both traditional garden beds and raised beds, making them suitable for a variety of growing conditions.

Biennial, F1 Hybrid Cortland is the new onion on the block, developed from Prince and Copra for even longer storage.

Before sowing Cortland 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.

Use a dated label for Cortland Onion and compare actual emergence, growth, and harvest or bloom timing with the ranges in the current record. Local soil, temperature, light, moisture, and planting date can shift results. Keep observations with the remaining packet so the next sowing can be adjusted without replacing product-specific measurements with a universal calendar.

Explore related options in our Onion Growing Guide.