What Can You Do With Black Walnut Shells

Black walnut shells can be used in a surprising number of practical and creative ways around your home, garden, and workshop.
 
If you’ve been cracking black walnuts and tossing the shells in the trash, you’re throwing away one of the most versatile natural materials you can find.
 
These tough, woody shells are packed with tannins, have a gritty texture, and last for ages, making them useful for everything from polishing metal to repelling pests.
 
In this post, we’ll take a closer look at what you can do with black walnut shells and how to get the most out of them.
 
Let’s get into it.
 

What Can You Do With Black Walnut Shells?

What you can do with black walnut shells is limited mostly by your imagination, because they work as an abrasive, a dye source, a mulch, and even a craft supply.
 
Here are some of the best uses for black walnut shells.
 

1. Use Them as an Abrasive for Polishing and Blasting

Black walnut shells are crushed and sold commercially as a gentle abrasive for polishing and blast cleaning.
 
That’s because the crushed shells are hard enough to strip away rust, paint, and grime but soft enough not to damage delicate surfaces.
 
You can use crushed black walnut shells to polish brass, clean engine parts, or remove stubborn residue from tools.
 

2. Make a Natural Dye for Fabric and Wood

Black walnut shells are loaded with juglone and tannins, which makes them a fantastic natural dye.
 
You can boil the shells in water to create a rich brown dye that works beautifully on fabric, yarn, and wood.
 
Soak your material in the dye bath, and you’ll end up with warm, earthy tones that deepen over time.
 

3. Spread Them as Mulch in the Garden

Black walnut shells make a durable, long-lasting mulch for garden beds and pathways.
 
They break down slowly, suppress weeds, and give your landscaping a neat, rustic look.
 
Just keep in mind that black walnut shells contain juglone, so avoid using them around plants that are sensitive to it, like tomatoes and peppers.
 

Creative and Practical Uses for Black Walnut Shells

Beyond the workshop and garden, there are plenty of other clever ways to put black walnut shells to work.
 

1. Repel Pests Naturally

One of the smartest things you can do with black walnut shells is use them to keep pests away.
 
The rough texture and natural compounds in the shells make them a barrier that slugs, snails, and certain insects won’t cross.
 
Spread crushed black walnut shells around your garden beds to protect your plants without chemicals.
 

2. Fire Up Your Grill or Smoker

Black walnut shells burn hot and slow, which makes them great for grilling and smoking.
 
Toss a handful onto your charcoal, and they’ll add a subtle, nutty aroma to whatever you’re cooking.
 
Just remember that the shells need to be fully dried before you use them, or they’ll smoke too much.
 

3. Get Crafty With Jewelry and Décor

If you’re the crafty type, black walnut shells are a goldmine for DIY projects.
 
You can polish them, drill small holes in them, and turn them into beads, buttons, and pendants.
 
Their deep, rich color and natural grain make them a beautiful addition to handmade jewelry and rustic décor.
 

How to Prepare Black Walnut Shells for Use

Before you can do much with black walnut shells, you need to prepare them properly.
 

1. Dry Them Completely

Fresh black walnut shells hold moisture, so spread them out in a single layer and let them air-dry for a few weeks.
 
If you skip this step, they’ll grow mold and won’t burn or grind properly.
 

2. Clean Off the Husks

Remove any leftover husk material from the shells, since it can rot and attract pests.
 
A quick scrub with a stiff brush and a rinse will get them ready for drying.
 

3. Crush or Grind to the Right Size

Depending on what you’re using them for, you may need to crush or grind your black walnut shells.
 
A hammer, a sturdy blender, or a dedicated grinder will do the job, and you can sift the results to get a consistent texture.
 

So, What Can You Do With Black Walnut Shells?

What you can do with black walnut shells is far more than most people realize, because they work as an abrasive, a dye, a mulch, a pest barrier, and a craft material.
 
So the next time you’re cracking black walnuts, don’t toss those shells in the trash.
 
Dry them, crush them, and put them to work, and you’ll be amazed at how many uses for black walnut shells you’ll find around your home and garden.