Most nutshells are useful to some extent, depending on the circumstances. Walnut shells can be used for cleaning and polishing, as a filler in dynamite, and as a paint thickening agent. Shells from pecans, almonds, Brazil nuts, acorns, and most other nuts are useful in composting.

Can I put nut shells in my garden?

Answer: Peanut shells are great for mulching. They are a terrific source of nitrogen, phosphorus, and potassium. Add some cottonseed meal to ground or broken-up peanut shells to help them decompose and prevent them from compacting after a rain, then apply as you would any mulch.

Are crushed nut shells good for the garden?

Benefits. Nutshells offer many of the same benefits as other composting materials. They contain nutrients that are released into your garden soil, and because they are more coarse than most composting materials, mixing them in with your compost pile will improve its structure and drainage.