How Do You Kill Off Blackberry Bushes

You can kill off blackberry bushes by cutting them down and then digging out the roots.
 
But if you’ve ever tried to kill off blackberry bushes, you know they don’t go down without a fight.
 
These thorny invaders send out long canes that root wherever they touch the ground.
 
So even if you cut them back, they’ll often sprout right back from the roots or from those rooted cane tips.
 
That’s why you need a plan that targets both the top growth and the root system.
 
In this post, we’ll go over several ways to kill off blackberry bushes for good, including manual removal, smothering, and careful herbicide use.
 
Let’s dig in.
 

Why You Need to Kill Off Blackberry Bushes Carefully

Blackberry bushes are tough, and if you don’t kill off blackberry bushes properly, they can take over your garden fast.
 
Here’s why they’re so hard to get rid of.
 

1. They Spread by Canes and Roots

Blackberry bushes spread by canes that arch over and root at the tips.
 
They also have deep, woody root balls that store energy.
 
So when you cut off the top, the roots just send up new shoots.
 
That’s why you have to kill off blackberry bushes at the root level, not just the surface.
 

2. They Thrive in Many Conditions

These bushes grow in sun or partial shade and tolerate poor soil.
 
That adaptability means you can’t just change the soil to kill off blackberry bushes.
 
You need a direct approach.
 

3. They Come Back from Small Root Pieces

Even a small piece of root left in the ground can regrow.
 
So when you kill off blackberry bushes, you must remove as much of the root system as possible.
 

Manual Ways to Kill Off Blackberry Bushes

If you prefer to avoid chemicals, you can still kill off blackberry bushes with elbow grease.
 
Here are the best manual methods.
 

1. Dig Out the Roots

The most thorough way to kill off blackberry bushes is to dig them out.
 
Use a shovel or mattock to loosen the soil around the base.
 
Then pull out the entire root ball and any large roots.
 
This works best when the soil is moist but not soggy.
 
Be sure to remove all root fragments, or they’ll sprout again.
 

2. Cut and Repeat

If digging isn’t possible, cut the canes to the ground repeatedly.
 
Every time new growth appears, cut it back.
 
Over time, this starves the roots and can kill off blackberry bushes.
 
But it takes patience and many rounds of cutting.
 

3. Smother with Mulch or Cardboard

You can also kill off blackberry bushes by blocking sunlight.
 
Cut the canes down first, then cover the area with thick cardboard or several layers of newspaper.
 
Top with wood chips or mulch.
 
This smothers the roots and prevents regrowth.
 
Leave it in place for several months to a year.
 

Using Herbicides to Kill Off Blackberry Bushes

Sometimes manual methods aren’t enough, and you need an herbicide to kill off blackberry bushes.
 
Here’s how to do it safely and effectively.
 

1. Choose the Right Herbicide

Look for a systemic herbicide that contains glyphosate or triclopyr.
 
These chemicals travel down to the roots and kill off blackberry bushes from the inside.
 
Always follow the label instructions carefully.
 

2. Cut and Treat the Stumps

Cut the canes down to the ground.
 
Immediately paint the fresh cuts with undiluted herbicide.
 
This method, called cut-stump treatment, is very effective to kill off blackberry bushes.
 

3. Spray the Leaves

If the bushes are actively growing, you can spray the leaves with herbicide.
 
Do this on a calm day to avoid drift onto other plants.
 
It may take a few weeks, but the roots will die.
 

4. Repeat as Needed

One treatment rarely kills off blackberry bushes completely.
 
Monitor the area and retreat any regrowth.
 

Preventing Blackberry Bushes from Coming Back

After you kill off blackberry bushes, you want to keep them from returning.
 
Here’s how.
 

1. Monitor the Area

Check the site every few weeks for new shoots.
 
Pull them immediately before they get established.
 

2. Maintain Thick Ground Cover

Plant grass or other dense ground cover to crowd out any remaining blackberry seeds or roots.
 

3. Keep Edges Tidy

Blackberries often invade from neighboring properties.
 
Cut back any canes that creep over your fence line.
 

So, How Do You Kill Off Blackberry Bushes?

You can kill off blackberry bushes by combining cutting, digging, smothering, and targeted herbicide use.
 
It’s not a one-and-done job, but with persistence, you can kill off blackberry bushes and reclaim your garden.
 
Remember to remove the roots, block sunlight, and treat any regrowth.
 
With a little patience, you’ll finally kill off blackberry bushes for good.