Wood Species Guide
Claro Walnut
Juglans hindsii (also Juglans californica and hybrids)
Also called: Northern California Black Walnut, Hinds Walnut, California Black Walnut, California Walnut, Claro
About the name “Claro Walnut”
Claro walnut is the trade name for California's native black walnuts, mainly Juglans hindsii. Much of it comes from old orchard trees, where claro was the rootstock grafted to English walnut. Where claro and English walnut wood meet at the graft, or where the two cross (Paradox and Bastogne walnut), the figure can be spectacular, and the wood is often still sold as claro.
What Claro Walnut looks like
Medium to dark brown heartwood with swirls of purple, gold and black, often more varied and marbled than eastern black walnut. Sapwood is pale.
Grain and texture
Straight to wild and swirling grain with a medium texture. Crotch, curly and burl figure are common in big orchard trees.
Working Claro Walnut: planing, cutting and gluing
Works much like black walnut, cutting, carving and gluing well. Figured and burled areas can tear out, so use sharp tools, light passes or a drum sander, and flatten slabs on a CNC or router sled.
Finishing Claro Walnut: oil, film finishes and epoxy
Oil makes the marbled color glow, and hardwax oil, lacquer and varnish all work well. Seal before epoxy, because the open pores and any punky sapwood will outgas. Fine dark dust can bleed into light or clear fills, so vacuum well and seal first.
Durability, stability and Florida humidity
The heartwood is rated fairly durable, but it is a furniture wood, not an outdoor one in our climate. It is stable once dry. In Florida, acclimate slabs in air conditioning and finish both faces.
Shop notes from our Fort Myers shop
Claro is the walnut people pick when they want drama: wide slabs with marbled purples and golds and wild crotch figure. It is a top choice for statement dining tables, river tables and gunstocks, and prices climb fast with figure. Flatten slowly and support the slab well, since big crotch slabs can move. We don't stock it, but ask us and we can often source it.
Common uses for Claro Walnut
Live-edge tables, river tables, gunstocks, guitar backs and sides, furniture, turned bowls and veneer.
Sustainability and CITES status
Not listed in the CITES Appendices. Wild Northern California black walnut is rare and listed as Vulnerable on the IUCN Red List, but most claro lumber comes from old orchard rootstock and ranch trees rather than wild stands.
Safety and toxicity
- Sensitizer (allergy builds with exposure)
- Skin irritation
- Eye irritation
Like other walnuts, claro is a known sensitizer, and some people get skin or eye irritation from the dust. The shavings can harm horses, so never use them for bedding.
- In the shop
- Dust collection + mask when sanding; gloves for sensitive skin
- Food contact
- Good choice for cutting boards, bowls and utensils
General information, not medical advice. See a doctor if you have a reaction.
Walnuts are known sensitizers, and claro can cause the same skin and eye irritation as black walnut. Use dust collection and a mask, and gloves if your skin reacts.
Claro Walnut in stock now
Ask us. We can often source it.
We don't have Claro Walnut listed online right now, but new slabs and lumber come in all the time and not everything makes it to the website. Tell us what you're building and we'll check our racks and suppliers.
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