Yellow Cipollini Onion Seeds | Flat Italian Cooking Onions

Yellow cipollini onion seeds grow small to medium, flattened onions with yellow skins and a bold onion bite that becomes deliciously sweet when cooked. Roast them whole, caramelize them slowly, or add them to braises for tender, richly flavored onions. Their compact, disc-like shape makes them a distinctive addition to the kitchen garden.

Choose your seed pack

• 200 seeds.
• 1,000 seeds.
• 1/4 oz pack.
• 1 oz pack.
• 1/4 lb pack: 4 oz.
• 1 lb pack.

One cart quantity purchases one selected pack. Weight-based packs are sold by weight, not a guaranteed seed count. This listing is for seeds to plant, not onion sets, bulbs, transplants, or harvested onions.

Onion characteristics

• Type: yellow cipollini cooking onion.
• Shape: flattened, disc-like bulbs.
• Typical bulb size: approximately 1 1/2–3 inches across and 3/4–1 inch deep, depending on conditions and spacing.
• Flavor: pungent raw, with sweetness developing during cooking.
• Uses: roasting, caramelizing, braising, bunching, and braiding after proper curing.
• Storage: best suited to short-term storage rather than a guaranteed long-storage crop.

Important growing-region guidance

This selection is recommended for approximately 38–60° latitude. Onion bulbing responds to day length, so location matters. At lower latitudes, plants may develop thick necks and may not form or cure bulbs well. Do not assume this selection is suitable as a short-day onion for southern or tropical gardens.

Sowing and starting plants

Sow in early spring when the soil is workable and conditions are appropriate for your area. Where a longer indoor start is needed, raise seedlings before your local transplanting window and gradually acclimate them before planting outdoors.

Sow approximately 1/4–1/2 inch deep in a fine seedbed or seed-starting mix. Keep evenly moist while seeds germinate and seedlings establish. For direct sowing, seeds can be placed approximately 1/2 inch apart initially, then thinned according to the harvest size you want.

Soil, light, and spacing

Choose full sun and fertile, well-drained soil. Work finished compost into the bed before planting; a soil pH of approximately 6.2–6.8 is suitable.

For developed bulbs, thin or transplant approximately 4–6 inches apart, leaving room between rows for cultivation. Closer spacing can produce smaller onions for bunching, but does not remove the need to manage crowding. Keep beds weed-free because onions compete poorly with weeds.

Watering and feeding

Maintain consistent soil moisture during establishment and active growth without waterlogging. As bulbs mature and tops begin to fall naturally, reduce unnecessary irrigation and avoid keeping the necks and soil persistently wet.

Base feeding on soil needs and fertilizer label directions. Soil sulfur can influence onion pungency, but choosing a fertilizer alone will not guarantee a particular flavor. Avoid excessive late feeding that encourages soft growth when bulbs should be maturing.

Growing in containers

Use a wide container with drainage holes and approximately 10–12 inches of usable soil depth. Fill with potting mix suitable for vegetables, provide full sun, and maintain bulb spacing. Check moisture frequently while avoiding standing water. Container growing does not change the variety's day-length requirements.

Harvesting and curing

Harvest for bulbs when they reach the desired size and the tops begin falling over and browning naturally. Do not force the tops down to hurry maturity. Loosen the soil gently before lifting.

Shake off loose soil without washing bulbs intended for curing. Leave protective wrapper skins intact and cure in a dry, shaded, well-ventilated place until the necks and outer skins are dry. Protect from rain and strong direct sun. Use damaged or thick-necked bulbs promptly rather than storing them.

Kitchen use and storage

Store properly cured, sound bulbs in a cool, dry, ventilated place and check regularly. This selection is intended for short-term storage; discard soft or decaying onions. Peel and wash as needed before preparation.

Roasting and slow caramelizing bring out the sweetness of these pungent onions. Their flattened form also works well in braises and other cooked vegetable dishes.

Safety and unused seed storage

Onions are toxic to dogs and cats if eaten. Keep plants, scraps, and cooked onion dishes away from pets. Keep unused seeds sealed in a cool, dry, dark place.