How To Stop Blackberry Bushes From Spreading

You can stop blackberry bushes from spreading by cutting the canes to the ground and digging out the root crowns before they have a chance to sucker.
 
Blackberry bushes spread aggressively through underground runners and tip-rooting, so the goal is to kill the roots, not just the visible canes.
 
If you’ve been asking how to stop blackberry bushes from spreading, you’re in the right place because this is one of the most stubborn invasive plants you’ll ever deal with.
 
In this post, we’ll look at why these bushes spread so fast, how to stop blackberry bushes from spreading for good, and how to keep them from coming back next season.
 
Let’s dig in.
 

Why Blackberry Bushes Spread So Aggressively

Blackberry bushes spread because they have two weapons: underground roots and arching canes.
 
Understanding both is the key to stopping them for good.
 

1. Underground Runners and Suckers

The biggest reason blackberry bushes spread is their creeping root system.
 
Those roots send up new shoots called suckers, sometimes several feet away from the parent plant.
 
This means a single blackberry bush can turn into a thicket in just one or two seasons.
 

2. Tip-Rooting Canes

Blackberry canes arch over and touch the ground, where the tips root and form brand new plants.
 
This is why blackberry bushes spread so well along fence lines and garden edges.
 
If you leave a cane touching soil, you’ll have another bush before you know it.
 

3. Birds and Wildlife Spread Seeds

Even if you remove every cane, birds eat the berries and drop seeds elsewhere.
 
That’s another sneaky reason blackberry bushes spread into new areas of your yard.
 

How to Stop Blackberry Bushes From Spreading

Stopping blackberry bushes from spreading takes persistence, but it’s totally doable.
 
Here’s how to do it step by step.
 

1. Cut the Canes Down First

Start by cutting all the canes to the ground with loppers or a brush cutter.
 
This weakens the plant and makes the root crowns easier to reach.
 
Don’t just mow and walk away, though, because blackberry bushes will regrow fast from the roots.
 

2. Dig Out the Root Crowns

The root crown is the woody base where all the canes meet the soil.
 
Dig it out completely with a shovel or mattock to stop blackberry bushes from spreading.
 
If you leave even a chunk of the crown behind, it’ll send up new shoots within weeks.
 

3. Pull Out the Runners

After removing the crown, follow the underground runners and pull them out by hand.
 
This is tedious work, but it’s the most reliable way to stop blackberry bushes from spreading.
 
A garden fork helps you loosen the soil without breaking the roots into pieces.
 

4. Smother the Area With Mulch or Cardboard

Once the main roots are gone, cover the ground with thick cardboard and a layer of mulch.
 
This blocks sunlight and smothers any root fragments you missed.
 
Smothering is one of the best ways to stop blackberry bushes from spreading without chemicals.
 

5. Use Herbicide as a Last Resort

If the blackberry bushes keep coming back, you can spot-treat the regrowth with a glyphosate-based herbicide.
 
Apply it directly to the leaves when the plant is actively growing.
 
This helps stop blackberry bushes from spreading without harming nearby plants.
 

6. Mow New Shoots Regularly

Any new shoots that pop up should be mowed or cut down immediately.
 
Repeated cutting starves the roots and eventually kills the plant.
 
This is how to stop blackberry bushes from spreading over the long haul.
 

How to Keep Blackberry Bushes From Spreading Long-Term

Once you’ve cleared the main patch, staying on top of regrowth is everything.
 
Check the area every couple of weeks during growing season and pull any new shoots.
 
If you actually want to keep blackberry bushes, plant them in containers or install a root barrier.
 
A barrier buried at least 2 feet deep will stop blackberry bushes from spreading into your garden beds.
 
Also, never let canes touch the ground, since that’s how they tip-root and multiply.
 
Keep the area mowed around your bushes and remove any wild blackberry plants nearby.
 
Consistency is what stops blackberry bushes from spreading for good.
 

So, How Do You Stop Blackberry Bushes From Spreading?

You stop blackberry bushes from spreading by cutting the canes, digging out the root crowns, and staying on top of new shoots.
 
Blackberry bushes spread through underground runners and tip-rooting, so the roots are the real target.
 
Smothering, mowing, and spot-treating regrowth will stop blackberry bushes from spreading over time.
 
Hope this post helped you figure out how to stop blackberry bushes from spreading in your own yard.