How Do You Kill A Walnut Tree

You kill a walnut tree by cutting it down and then treating the stump so it doesn’t grow back.
 

That sounds simple enough, right?
 

But here’s the catch: a walnut tree rarely dies just because you cut it down.
 

In fact, if you’ve ever tried to kill a walnut tree, you already know how stubborn these things can be.
 

They send up new shoots from the stump, they drop thousands of walnuts that sprout everywhere, and they release a chemical that makes life miserable for anything growing nearby.
 

So if you’re asking how do you kill a walnut tree, the honest answer is you need a plan, not just a chainsaw.
 

In this post, we’ll walk through how to kill a walnut tree properly, why walnut trees are so hard to kill, and the methods that actually work.

Why Walnut Trees Are So Hard to Kill

Walnut trees don’t go down without a fight, and there are a few real reasons why killing a walnut tree takes more effort than most people expect.
 

1. They Resprout From the Stump

When you cut down a walnut tree, the root system is still very much alive.
 

That massive root network has stored energy, and it will happily push out new shoots from the stump within weeks.
 

So simply cutting the tree won’t kill it, you have to deal with the stump or the roots too.
 

2. They Produce Juglone

Walnut trees produce a chemical called juglone, which is toxic to many plants, and it’s one reason people want them gone in the first place.
 

Juglone leaches into the soil from the roots, leaves, and husks.
 

This makes it hard to grow anything near a walnut tree, and it’s also a hint that the tree is deeply rooted and aggressive.
 

3. They Drop Piles of Walnuts

Every fall, a mature walnut tree drops walnuts everywhere.
 

And each of those nuts is a potential new tree.
 

So even if you kill the main tree, you may find yourself fighting seedlings for years afterward.
 

That’s why killing a walnut tree is really about killing the tree AND stopping the next generation.

How Do You Kill a Walnut Tree: Methods That Work

Now let’s get into how do you kill a walnut tree using methods that actually get the job done.
 

1. Cut and Treat the Stump

The most reliable way to kill a walnut tree is to cut it down and immediately treat the stump.
 

Cut the tree as close to the ground as you can.
 

Then, within minutes, apply a concentrated herbicide like glyphosate or triclopyr directly to the fresh cut surface.
 

The tree pulls the herbicide down into the roots while the wound is still open, killing the whole system.
 

If you wait too long, the cut seals up and the herbicide won’t travel.
 

2. Use the Hack and Squirt Method

If you’d rather not cut the tree down right away, the hack and squirt method is a great option.
 

Use a hatchet to make cuts around the trunk, angled downward into the bark.
 

Then squirt herbicide into each cut.
 

The tree absorbs it and slowly dies over a few weeks.
 

This is a popular way to kill a walnut tree without a big cleanup.
 

3. Girdle the Tree

Girdling means cutting a ring through the bark all the way around the trunk.
 

This stops the tree from moving nutrients, and it will eventually die.
 

Just know that girdling alone can take a season or two, and walnut trees sometimes try to heal the wound.
 

Combining girdling with herbicide makes it much more effective.
 

4. Drill Holes Into the Trunk

For larger walnut trees, drilling holes into the trunk and filling them with herbicide works well.
 

Drill at a downward angle every few inches around the trunk.
 

Then fill each hole with herbicide.
 

The tree takes it in and carries it to the roots, killing the walnut tree from the inside out.

Mistakes to Avoid When Killing a Walnut Tree

Plenty of people try to kill a walnut tree and fail, and it’s almost always because of one of these mistakes.
 

1. Cutting Without Treating the Stump

This is the biggest one.
 

If you cut a walnut tree and walk away, you’ll have a stump full of new shoots before you know it.
 

Always treat the stump right after cutting.
 

2. Leaving Walnuts on the Ground

Those fallen walnuts will sprout, and suddenly you’re dealing with a walnut tree problem all over again.
 

Rake them up and dispose of them after you kill the tree.
 

3. Using the Wrong Herbicide

Not every herbicide works on walnut trees.
 

You want something that’s labeled for cut stump or basal bark treatment, like glyphosate or triclopyr.
 

Read the label and follow it, since these are serious chemicals.
 

4. Giving Up Too Soon

A walnut tree can take weeks or even months to fully die.
 

Don’t assume it survived just because it’s still standing.
 

Watch for regrowth, and if you see shoots, treat them again.

So, How Do You Kill a Walnut Tree?

You kill a walnut tree by cutting it down and treating the stump, or by using methods like hack and squirt, girdling, or drilling holes with herbicide.
 

The key is getting the herbicide into the tree so it reaches the roots, because cutting alone won’t do it.
 

Clean up the walnuts, watch for regrowth, and be patient.
 

Do it right, and you’ll finally get rid of that stubborn walnut tree for good.