The cobnut is basically a cultivated hazel. The tree is self-sterile, but if you have hedgerows or woodland nearby, pollen from the yellow catkins of wild hazels will fertilize the flowers. If not, you should plant two varieties. The tree is robust, hardy and easy to grow; the nuts are great!

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Cobnuts, photo courtesy of Ida@Sustain/flickr.com
Cobnuts, photo courtesy of Ida@Sustain/flickr.com