Will Weed Killer Kill Blackberry Bushes

Weed killer can kill blackberry bushes, but getting rid of these tough plants isn’t always as simple as spraying and walking away.
 
Blackberry bushes are notoriously resilient, and their deep root systems often survive a single application of weed killer.
 
So while weed killer can kill blackberry bushes, you’ll need the right product, the right timing, and a bit of patience to finish the job.
 
If you’ve been battling blackberry bushes taking over your garden, you’re in the right place.
 
In this post, we’ll look at whether weed killer will kill blackberry bushes, which products work best, and how to apply them so the bushes don’t come roaring back.
 
Let’s dig in.
 

Will Weed Killer Kill Blackberry Bushes?

Yes, weed killer will kill blackberry bushes when you choose the right type and apply it correctly.
 
Here’s why weed killer can kill blackberry bushes and what makes the process work:
 

1. The Right Herbicide Targets the Roots

Not every weed killer will kill blackberry bushes.
 
You need a systemic herbicide, which gets absorbed through the leaves and travels down into the roots.
 
Contact killers only burn the surface, and that’s why blackberry bushes often bounce back after a quick spray.
 
Products containing glyphosate or triclopyr are the go-to choices when you want weed killer to kill blackberry bushes for good.
 

2. Blackberry Bushes Have Tough Root Systems

Blackberry bushes spread through sprawling canes and deep, woody roots.
 
That’s exactly why a single splash of weed killer rarely does the trick.
 
The roots store enough energy to push out new growth even after the visible plant looks dead.
 
So when weed killer does kill blackberry bushes, it’s because the chemical reached those roots and drained their reserves.
 

3. Timing Makes a Big Difference

Weed killer will kill blackberry bushes more effectively when you spray at the right time.
 
Late summer or early fall is ideal because the plant is actively pulling nutrients down toward its roots.
 
That downward flow carries the herbicide straight to where it needs to go.
 
Spray in the wrong season, and you may only kill the top growth while the roots keep on living.
 

4. Repeat Applications Are Often Necessary

Even the best weed killer may need more than one round to kill blackberry bushes completely.
 
You’ll usually spray, wait a few weeks for the plant to die back, then treat any new shoots that pop up.
 
Staying consistent is the secret, because blackberry bushes are stubborn and rarely give up after one hit.
 

How to Use Weed Killer to Kill Blackberry Bushes

If you want weed killer to kill blackberry bushes, how you apply it matters just as much as what you buy.
 
Here’s how to get it right:
 

1. Cut Back the Canes First

Trim the blackberry bushes down to a manageable height before you spray.
 
This makes the plant easier to work with and encourages fresh growth that absorbs weed killer more readily.
 
Just don’t cut them all the way to the ground, since you need leaves for the herbicide to stick to.
 

2. Spray When It’s Dry and Calm

Choose a day with no rain in the forecast and little to no wind.
 
Rain can wash the weed killer off before it soaks in, and wind can carry it onto plants you want to keep.
 
For weed killer to kill blackberry bushes, the spray needs time to dry on the leaves.
 

3. Cover the Leaves Thoroughly

Spray until the leaves are wet but not dripping.
 
Every leaf you miss is a spot where the blackberry bushes might survive.
 
A pump sprayer or a brush to paint the herbicide directly onto cut stems both work well for this job.
 

4. Be Patient and Watch for Regrowth

After spraying, give the weed killer a couple of weeks to work.
 
You’ll see the leaves yellow, wilt, and eventually drop off.
 
If new canes appear, treat them again, because that’s the only way weed killer will kill blackberry bushes down to the root.
 

5. Consider Non-Chemical Backup

Sometimes weed killer alone won’t kill blackberry bushes that have been established for years.
 
Digging out the roots or smothering the area with a thick tarp can finish what the herbicide started.
 
Combining methods is often the fastest way to say goodbye to blackberry bushes for good.
 

So, Will Weed Killer Kill Blackberry Bushes?

Weed killer can kill blackberry bushes, but only when you pick a systemic herbicide and apply it with a little strategy.
 
A single spray usually isn’t enough because those roots are built to survive.
 
With the right product, the right timing, and a repeat application or two, weed killer will kill blackberry bushes and keep them from taking over your yard again.
 
Hope this post has helped you understand whether weed killer will kill blackberry bushes and how to get the job done right.