Calibra Onion Transplants – Certified Organic


SOLD OUT FOR THE SEASON 2023! Please return in January 2024 to order early for spring planting.

Number of Transplants
25 Transplants

Out of stock

50 Transplants

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75 Transplants

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100 Transplants

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Calibra Certified Organic Onion transplants

Calibra Certified Organic Onion transplants are a mild, sweet Spanish-style onion that are easy to grow.  Similar in sweetness to “Candy”, Calibra has less moisture and the 3-4″ bulbs are more suitable for longer storage. A long-intermediate day onion, Calibra is well adapted for Mid-Northern states, latitudes from Maine to Northern Texas.

    • Yellow, globe shape with golden tan colored skins
    • Sweet like Candy, but slightly smaller bulbs for longer storage
    • EASY to grow
    • Long-Intermediate Day –  produces well with 12 to 13 hours of sunlight
    • Grows best in latitudes from Northern Texas to Maine
    • Long Storing – 4-6 months with the right storage conditions
    • 85-100 days from transplant
    • 3″-4″ bulbs
  • TRANSPLANT INFORMATION: Our organic onion transplants are dormant when shipped. It is normal for them to be pale & slightly dry due to dormancy & shipping. In fact, onions are very hardy & can live off of the bulb for approximately three weeks. Generally, we recommend planting within one week. These healthy transplants will thrive if well cared for. For your gardening success, we have switched from selling potted onion plants to onion transplants .
  • SHIPPING INFORMATION: We ship all dormant transplants starting at the beginning of early April. We dig and then dry the onions.  Once dry and they turn dormant until you plant them.  We ship them within 7-10 days of being dug, so you receive a fresh, dormant, dry onion transplant that is really to grow.  Plant as soon as you can or within a week.  Keep in a cool, dry area until planting.
  • REGIONAL ONION PLANTING: Our onions are well-adapted for mid-northern states. If your region requires earlier planting, consider our Naturally-Grown Onion Sets or you may want to source your onion transplants from a local nursery. For more information, see our Keene Garlic Seasonal Order Shipping Guide.  Always search for growing onions in your region for the best onions and planting times.



Basic Onion Growing Info

Sun Requirement: Onions require full sun – the more the better! Therefore, avoid planting next to crops that might shade your onions.
Soil Fertility: Onions prefer soil with a pH between 6.2 and 6.8. If your soil is too acidic, add ground limestone; if it is too alkaline, add peat moss. Adding compost or a balanced organic fertilizer is essential for growing healthy onions, especially if your soil fertility is low. For the best growth and yield, onions need fertilizer at planting time and additional side dressing.
Planting: Onions grow best on raised beds or raised rows at least 4″ high. Typically, onions can be planted as early as 4 to 6 weeks before the last estimated spring frost.
***For detailed instructions on how to grow onions from planting to fertilizing, all the way to harvest/storage, see this post on our blog:


Our Organic Garlic Fertilizer works great for onion plants too! Its special formulation offers nutrients that all alliums need. Keene Garlic’s Fertilizer is rich in just the right blend of macro- & micro-nutrients, all from organic sources, for healthier, larger garlic & onion bulbs.


All our products are farm fresh and subject to an occasional crop loss.  We do everything we can to prevent this, but sometimes mother nature wins.  When placing your order, please choose the substitution choice, so we can serve your needs the best way possible.  We do have a comment section for further information you may want to provide us.

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Number of Transplants

25 Transplants, 50 Transplants, 75 Transplants, 100 Transplants


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