Type
long-day storage
Onion variety
Copra Onion
A pungent yellow onion known for excellent storage potential and solid bulb quality. It is a strong choice for northern gardeners wanting winter keepers.
Days to maturity
104
Best for
storage, cooking
About Copra
Copra is a long-day hybrid prized as one of the best storage onions for northern gardens. It forms hard, dense, medium-sized bulbs with dark yellow skin and firm, pungent, high-sugar flesh that develops strong flavor when cooked. Its tight necks and solid structure are what allow it to keep for many months in proper storage.
Growing Copra Onion
Start seed early or use transplants set about 3 to 4 inches apart in fertile soil, since strong early growth drives good bulb size for a storage onion. Ease off watering as the bulbs mature to encourage firm, well-cured onions. Harvest when the tops fall and necks dry down, then cure thoroughly, and stored bulbs can hold well into winter and beyond.
Full growing guide
For planting dates, care, and harvest that apply to all onions, see the complete guide.
How to grow OnionsOther onions varieties
Variety characteristics are general guidance for US home gardens; performance varies by climate, soil, and season. Seed and plant availability differs by supplier. Page updated Aug 4, 2026.