Echoing the pistachio shells that started this site, I was thinking about walnut shells recently.

It’s advised not to compost walnuts/walnut shells because the trees contain a chemical called juglone, which is toxic to some trees, plants and vegetables (especially members of the Solanaceae family – aubergine, tomatoes & potatoes) so better safe and than sorry when it comes to composting them.

Walnut shells have a number of industrial uses – a thickener in the paints & plastics industries, as a filler in explosives, and for cleaning/polishing – but less re-uses in the domestic setting. I’ve used exfoliating soaps and cleansers with tiny walnut shell particles as the abrasive element so home soap makers could use them up – but what about other reuses?