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Walnut shells can be repurposed in a surprising number of practical, creative, and even money-saving ways around your home and garden.
If you’ve ever cracked a batch of walnuts for a recipe and stared at that pile of hard shells wondering what to do with them, you’re not alone.
Most people toss them straight into the trash without a second thought, but those tough little shells are actually one of the most versatile natural materials you can keep around.
From polishing metal to keeping pests away, what you can do with walnut shells might genuinely surprise you.
In this post, we’ll walk through the best uses for walnut shells, including gardening tricks, cleaning hacks, and craft ideas that turn trash into something useful.
Let’s get into it.
What Can You Do With Walnut Shells Around the House?
What you can do with walnut shells around the house is more than you’d expect, and most of these ideas take just minutes to try.
Here are the top household uses worth knowing.
1. Use Them as a Gentle Abrasive for Polishing
Crushed walnut shells make an excellent natural abrasive for cleaning and polishing hard surfaces.
They’re tough enough to scrub away grime but soft enough not to scratch most metals and woods.
You can use ground walnut shells to polish brass, buff tarnished silver, or clean tough spots on tools.
This is one of the most popular industrial uses for walnut shells, and it works just as well at home.
2. Make a Natural Non-Slip Traction Grip
Sprinkle crushed walnut shells on icy walkways or slick garage floors for extra grip.
Unlike salt, walnut shells won’t damage your concrete or harm your plants.
They also work great mixed into paint to create a textured, non-slip surface on stairs and decks.
3. Freshen Up Your Fireplace or Grill
Walnut shells burn hot and clean, making them a handy fire starter or fuel additive.
Toss a handful into your fireplace, wood stove, or charcoal grill to help things ignite faster.
They also add a pleasant, nutty aroma while they burn.
What Can You Do With Walnut Shells in the Garden?
What you can do with walnut shells in the garden is just as impressive as the indoor uses.
Gardeners love them because they’re natural, long-lasting, and free if you’re already cracking walnuts.
1. Use Them as Mulch
Walnut shells make a durable, attractive mulch that holds up far longer than wood chips.
Spread a layer around your flower beds or shrubs to lock in moisture and suppress weeds.
Just keep them away from acid-loving plants, since walnut shells can slightly raise soil pH over time.
2. Improve Drainage in Potted Plants
Drop a layer of walnut shells at the bottom of your pots before adding soil.
This creates a drainage barrier that keeps roots from sitting in soggy soil.
It’s a simple trick that can save your houseplants from root rot.
3. Keep Pests Away
The rough texture of crushed walnut shells irritates slugs, snails, and other soft-bodied pests.
Sprinkle a ring around your plants to create a natural barrier they won’t cross.
It’s a chemical-free way to protect your veggies and flowers.
What Can You Do With Walnut Shells for Crafts and DIY?
What you can do with walnut shells for crafts opens up a whole world of creative projects.
If you’re the crafty type, these ideas are worth trying.
1. Make DIY Potpourri or Sachets
Walnut shells hold scent beautifully, making them perfect for homemade potpourri.
Fill a small bowl or fabric sachet with shells, then add a few drops of essential oil.
They’ll slowly release fragrance for weeks, freshening up closets, drawers, or bathrooms.
2. Create Rustic Jewelry or Ornaments
Whole walnut shell halves can be painted, varnished, and turned into pendants, brooches, or holiday ornaments.
Their natural shape and texture give handmade pieces a charming, rustic feel.
Kids especially love decorating them for seasonal crafts.
3. Use Them as Filler for Weighted Projects
Crushed walnut shells are a lightweight, eco-friendly filler for DIY beanbags, pin cushions, or weighted blankets.
They add bulk and a bit of heft without the cost of synthetic beads.
So, What Can You Do With Walnut Shells?
Walnut shells can be reused in dozens of practical ways, from polishing metal and mulching your garden to crafting homemade ornaments and natural pest barriers.
Instead of throwing them out after your next batch of baking, think of them as a free, versatile material sitting right in your kitchen.
Whether you’re a gardener, a DIY enthusiast, or just someone who hates waste, there’s a use for walnut shells that fits your lifestyle.
So next time you crack a walnut, save the shell — you’ll be glad you did.