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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Claro Walnut Characteristics 
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Forum Responses
From Professor Gene Wengert, Sawing and Drying Forum technical advisor: Claro walnut is called Juglans californica. It is native to the USA. Common names include California black walnut, California walnut, claro walnut, southern California walnut. I do believe that this is the species you were offered. Claro walnut lumber would most often come from walnut orchard trees, so grain and color can be variable indeed. Note that it is a species all by itself, grown in Western U.S., and produces claro walnut lumber. Sometimes, claro walnut is grafted to the root stock of English walnut. This might be the source of information on the previous posting. This would be rare in the U.S. Sometimes claro root stock has English walnut grafted to it because the roots are resistant to decay and the top produces tasty sweet walnuts.
From contributor F: Being out west and having worked extensively with Claro walnut, I can tell you that English walnut is often grafted on to claro root stock and I have never seen the opposite. The reason for the grafting is that the claro root is heartier in this climate and soil and the English nuts are preferred because the shell is thinner and the yield of nut meat is much higher than from the black/claro which have thick shells and smaller nut meats. Although the trees the stock comes from are most often orchard trees, the trees grow rather large and the lumber is available in very long lengths and many thicknesses. Other than that, I can only say that this wood is beautiful and often figured when from a large tree. A real pleasure to work with. The English is different entirely and very pale in comparison. Have you reviewed the related Knowledge Base areas below? 
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