Name: Calibra Onion Plants - Certified Organic
SKU: 69842
Availability: OutOfStock

Calibra Onion Plants – Certified Organic

Pre-Orders Open in January

Shipping begins Mid April.

See Our Seasonal Shipping Guide

Number of Plants

Price

25 Plants

$13.98

Out of stock

50 Plants

$24.98

Out of stock

75 Plants

$34.98

Out of stock

Description

Calibra Certified Organic Onion Plants

Calibra Certified Organic Onion Plants are a mild, slightly sweet Spanish-style that are easy to grow. With less moisture than a typical sweet onion, Calibra produces 3-4″ bulbs that 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.

ONION DETAILS:
- Yellow, globe shape with golden tan colored skins
- Mild, slightly sweet flavor – perfect for eating raw or sautéed.
- 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

PLANT INFORMATION: Our Certified Organic Onion & Leek Plants are greenhouse-grown on small, family farms in Wisconsin. These live seedlings arrive in a container with soil, hardened off, and ready to plant. Our local organic onion growers prefer these onion starts because they are easy to grow with high yields.
SHIPPING INFORMATION: All Plants ship in April ONLY. Upon checkout, choose the April ship window that works best for you. Please note that ship dates may shift slightly due to Mother Nature. Plants may be cared for indoors until planting time, if needed.
REGIONAL ONION PLANTING: Our onions are well-adapted for mid-northern states, latitude range 35-45°. If your region requires earlier planting, consider our Naturally-Grown Onion Sets that begin shipping early March. If you require onion sets/plants earlier than March, we recommend finding a source closer to your region. For more information, see our Keene Garlic Seasonal Order Shipping Guide.

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: 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 throughout the growing season. Our Keene Garlic Fertilizer is great for all alliums!

Planting: Onions grow best in 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: Keene Garlic Onion Planting Guide

Onion, Shallot & Leek Plants ship April ONLY.

Keene Garlic Spring Products Shipping Information Graphic

***For more information about the shipping of our products, see the Keene Garlic Seasonal Order Shipping Guide.

About Us

Plant, Grow, Savor – trusted garden products

For nearly 20 years, Keene Garlic has focused on growing premium garlic and providing top‑quality seed so you can enjoy the satisfaction of cultivating your own. Each season, we partner with farms that follow organic practices to deliver trusted garden products. By working closely with experienced small family farms, we ensure every crop is grown with care, giving you the best foundation for success in your garden and kitchen.

From soil to table, our selection includes heirloom garlic, shallots, potatoes, onions, asparagus, and horseradish—all nurtured on sustainable family farms. To help your garden thrive, we also offer specialized blended organic fertilizers. And in the kitchen, our small-batch seasonings crafted from our homegrown, heirloom, organic garlic deliver bold, full flavor to every dish.

Choosing Keene Garlic means more than adding reliable, high-performing plants and products to your garden—it’s a commitment to supporting sustainable agriculture and generations of family farming.