Will 24d Kill Blackberries

24D will kill blackberries, but the results you get depend heavily on how and when you apply it.
 
If you’ve been battling blackberry brambles taking over your yard and wondering whether 24D will kill blackberries for good, the short answer is yes, it can.
 
But there’s a catch because blackberries are tough, woody perennials that don’t go down without a fight.
 
24D is a selective herbicide that targets broadleaf plants, and since blackberries are broadleaf plants, they’re on the hit list.
 
However, timing, concentration, and application method all play a huge role in whether 24D actually kills blackberries or just sets them back for a season.
 
In this post, we’ll walk through whether 24D will kill blackberries, why it works the way it does, how to apply it correctly, and what to expect afterward.
 
Let’s dig in.
 

Will 24D Kill Blackberries? Here’s the Deal

Yes, 24D will kill blackberries when applied correctly, but it’s not always a one-and-done solution.
 
Here’s why this herbicide works on blackberries and what you need to know before spraying.
 

1. 24D Is a Broadleaf Herbicide

24D is designed to target broadleaf weeds while leaving grasses mostly alone.
 
Blackberries are broadleaf plants, which means they absorb 24D through their leaves and stems.
 
Once inside, the herbicide mimics natural plant hormones and throws the blackberry’s growth system into chaos.
 
This uncontrolled growth eventually kills the plant by exhausting its energy reserves.
 

2. It Works Through Foliage Absorption

For 24D to kill blackberries, it has to land on and be absorbed by the leaves.
 
That’s why spraying during active growth in late spring or early summer works best.
 
The leaves are wide open, taking in sunlight and nutrients, which means they’ll also take in the 24D.
 
If you spray when the plant is dormant or stressed, the herbicide won’t translocate properly and the blackberries may survive.
 

3. It Translocates to the Roots

The real magic of 24D killing blackberries happens underground.
 
After absorption, the herbicide moves through the plant’s vascular system down into the roots.
 
Since blackberries spread through extensive root systems, hitting the roots is essential for a true kill.
 
If you only burn the top growth, those roots will send up new canes before you know it.
 

4. Timing Determines Success

24D will kill blackberries most effectively when applied during the plant’s active growing season.
 
Late spring through early summer is ideal because the plant is pushing energy upward and outward.
 
Spraying in late summer or fall can still work, but the plant is preparing for dormancy and may not absorb as much.
 
Avoid spraying during drought, extreme heat, or right before rain, since these conditions reduce effectiveness.
 

How to Use 24D to Kill Blackberries

Getting 24D to kill blackberries takes more than just spraying and hoping for the best.
 
Here’s how to do it right so you don’t waste time or herbicide.
 

1. Choose the Right Formulation

Not all 24D products are created equal.
 
Look for an amine or ester formulation labeled for woody plants and brush control.
 
Ester formulations tend to penetrate leaves better, especially in cooler weather, while amine formulations are gentler on nearby desirable plants.
 
Always read the label to confirm blackberries are listed as a target species.
 

2. Mix at the Correct Concentration

Using too little 24D means the blackberries survive, and using too much can harm surrounding plants.
 
Follow the label instructions for brush and bramble control, which usually call for a higher concentration than standard lawn weed spraying.
 
A typical mix for blackberries is around 1 to 2 percent solution, but always check your specific product.
 

3. Spray When Conditions Are Right

The best time to spray 24D on blackberries is on a calm, dry day with temperatures between 60°F and 80°F.
 
Wind can carry the spray onto nearby garden plants, so keep the nozzle low and aimed carefully.
 
Rain within six hours of application can wash the herbicide off before it’s absorbed, so check the forecast first.
 

4. Cover the Leaves Thoroughly

Every leaf you miss is a chance for the blackberry to bounce back.
 
Spray until the foliage is wet but not dripping, making sure to hit both the top and underside of leaves.
 
For thick patches, you may need to treat regrowth a few weeks later to catch canes that survived the first round.
 

5. Be Patient and Reapply if Needed

24D will kill blackberries, but it’s not instant.
 
You’ll typically see leaves curling, yellowing, and dying within one to two weeks.
 
Full root death can take a month or more, and stubborn plants may need a second application.
 
Don’t pull the canes too early because the herbicide needs time to travel down to the roots.
 

Things to Watch Out For When Using 24D on Blackberries

24D is effective, but it comes with some serious cautions.
 
Here’s what to keep in mind before you spray.
 

1. It Can Harm Desirable Plants

24D doesn’t discriminate between blackberries and your prize roses or vegetable garden.
 
Drift and overspray can damage or kill any broadleaf plant it touches, so shield nearby plants or spray on a still day.
 

2. It’s Not Great Near Water

Some 24D formulations can harm aquatic life and are restricted near ponds, streams, or wetlands.
 
If your blackberries are growing near water, look for an aquatic-approved herbicide or consider manual removal instead.
 

3. It Won’t Kill Grass

One upside of 24D is that it leaves most grasses unharmed.
 
That means if your blackberries are mixed into a lawn, the grass should recover while the brambles die back.
 

4. Repeated Treatments May Be Necessary

Blackberries are persistent, and their root systems can survive a single spraying.
 
Plan on monitoring the area for regrowth and treating new canes as they appear.
 
Combining 24D with manual removal or other herbicides can speed up the process.
 

So, Will 24D Kill Blackberries?

24D will kill blackberries when applied at the right time, at the right concentration, and with proper coverage.
 
It works by absorbing into the leaves and traveling down to the roots, where it disrupts growth and eventually kills the plant.
 
Just remember that blackberries are tough, so you may need more than one application and a little patience.
 
With the right approach, 24D can help you reclaim your yard from those stubborn brambles.