How To Stop Blackberry Bushes From Spreading

You can stop blackberry bushes from spreading by cutting the root system off from the cane and staying consistent with removal.
 
Blackberry bushes spread aggressively through underground roots called rhizomes and through canes that tip-root wherever they touch the soil.
 
That means if you only cut what you see above ground, the plant will keep coming back stronger.
 
If you’ve been wondering how to stop blackberry bushes from spreading, the answer is to attack the roots, block the canes, and stay on top of new growth.
 
In this post, we’ll go over the best ways to stop blackberry bushes from spreading, from simple manual methods to long-term control strategies that actually work.
 
Let’s dig in.
 

Why Blackberry Bushes Spread So Fast

Blackberry bushes spread so fast because they have two weapons: a creeping root system and canes that root themselves.
 

1. Rhizomes Keep Pushing Up New Canes

The biggest reason blackberry bushes spread is their rhizomes, which are underground stems that travel sideways.
 
Each rhizome can send up new canes several feet away from the main plant.
 
This is why you can pull a blackberry bush out of one spot and see it pop up in a totally different area weeks later.
 

2. Tip-Rooting Canes Create New Plants

Blackberry canes arch over and touch the ground, and where they touch, they root.
 
That single cane becomes a brand new blackberry bush without any help from you.
 
This is why letting canes flop over is basically inviting a blackberry takeover.
 

3. Seeds Spread Through Birds and Animals

Birds eat the berries and drop seeds wherever they go.
 
That means even if you clear your patch, new blackberry bushes can show up thanks to wildlife.
 
So stopping the spread means dealing with the plants you have and watching for new ones.
 

How to Stop Blackberry Bushes From Spreading

Stopping blackberry bushes from spreading comes down to killing the roots and preventing regrowth.
 
Here’s how to do it.
 

1. Cut Canes at the Base and Dig Out the Crown

Start by cutting every cane down to the ground with loppers or a brush cutter.
 
Then dig out the crown, which is the thick, woody base where the canes meet the roots.
 
If you remove the crown, you weaken the whole plant and slow its ability to spread.
 

2. Pull Rhizomes and Roots by Hand

After removing the crown, use a digging fork to loosen the soil and pull out the rhizomes.
 
Blackberry roots are orange-brown and easy to spot once you start digging.
 
Get as much of the root system as you can, because any piece left behind can regrow.
 

3. Smother the Area With Cardboard or Mulch

If you can’t dig everything out, smothering works well to stop blackberry bushes from spreading.
 
Lay down thick cardboard or several layers of newspaper, then cover with wood chips or mulch.
 
This blocks light and weakens the roots underneath over time.
 

4. Mow New Growth Consistently

Any new cane that pops up should be mowed or cut immediately.
 
Blackberry bushes need leaves to feed their roots.
 
If you keep cutting new growth every week or two during the growing season, the roots eventually starve.
 

5. Use Herbicides Carefully on Stubborn Patches

For really stubborn blackberry bushes, a targeted herbicide can help stop them from spreading.
 
Cut the canes and apply herbicide to the freshly cut stems.
 
Always follow the label directions and avoid spraying anything beneficial nearby.
 

6. Install a Root Barrier Around the Patch

If you want to keep blackberry bushes contained, bury a root barrier at least 12 inches deep around the perimeter.
 
This stops rhizomes from creeping into your garden beds or lawn.
 
It’s not foolproof, but it slows the spread a lot when combined with regular cutting.
 

Mistakes That Let Blackberry Bushes Spread

The biggest mistake is only cutting the tops and leaving the roots alone.
 
Another mistake is tilling the soil, which chops rhizomes into pieces and creates even more plants.
 
And letting canes tip-root by skipping regular pruning is basically giving blackberry bushes a free pass to spread.
 

So, How Do You Stop Blackberry Bushes From Spreading?

You stop blackberry bushes from spreading by removing the crown, digging out rhizomes, and staying consistent with cutting new growth.
 
Blackberry bushes spread through roots, tip-rooting canes, and seeds, so you have to attack all three.
 
Smothering, mowing, root barriers, and careful herbicide use all help stop blackberry bushes from spreading when combined.
 
Stay on top of it, and you’ll win the battle against blackberry bushes.