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A favorite for storing. Keeps well for about 10 months, providing onions for cooking until planting time rolls around again. Exceptionally sweet with a bold onion flavor. Round, medium-sized onions have a dark yellow skin and thin necks. Matures in 110 days. Hybrid. Long-day onion.

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Since 1816, Stark Bro’s has promised to provide customers with the very best fruit trees and plants. It’s just that simple. If your trees or plants do not survive, please let us know within one year of delivery. We will issue a one-time merchandise credit to your account equaling 125% of the original product purchase price. Read more about our warranty policy.


Fruit Color Yellow
Fruit Size Medium
Ripens/Harvest Matures In 110 Days
Shade/Sun Full Sun
Soil Composition Loamy
Soil Moisture Well Drained
Soil pH Level 6.2 - 6.8
Taste Sweet And Juicy
Texture Firm, Crisp
Years to Bear 1
Zone Range 3 - 9

Zone Compatibility

This Variety's Zone Range 3 - 9
My Hardiness Zone ?
The USDA hardiness zones offer a guide to varieties that will grow well in certain climates. Each zone corresponds to the minimum winter temperatures experienced in a given area. Make sure that your hardiness zone lies within the zone compatability range of this variety before ordering.


Pollination is not required for this variety.

This variety does not require pollination to produce a harvestable crop.

Tools & Supplies

Having the proper tools and supplies when growing your own can make the difference between a good harvest and a great harvest! Here's a list that our experts recommend for this variety.

Planting & Care

Learn all about how to grow onion plants in The Growing Guide. An entire section of our website dedicated to your growing success.


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Questions & Answers

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Browse 3 questions Browse 3 questions and 9 answers
Why did you choose this?
Stark Bro's Store
Generally a good keeper and grows pretty uniform
Robert P on Mar 14, 2017
Generally a good keeper and grows pretty uniform
Robert P on Mar 14, 2017
Great for storage
MARTHA C on Apr 27, 2016
Great for storage
MARTHA C on Apr 27, 2016
Is this like a scallion?
jimbo on Apr 19, 2016
BEST ANSWER: These should grow larger than scallions if they are in soft, well-fertilized soil. Do you have heavy clay? That could be an issue.

Customer Reviews

4.7 / 5.0
3 Reviews
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Best Onions
Copra onions are the best onions for storing. They have great flavor! Store them in a cool place and use them for months.
May 9, 2019
over 2 years ago
These are great onions overall
These are great keepers. Good large size and full bodied flavor as well. We always have enough left in storage to last until new crop is ready
May 16, 2018
over 3 years ago
cobra onion plant
Received them late in season, was told was a with the grower, when I received was SATISFIED.they produce well
August 6, 2016
over 6 years ago