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To prune Triple Crown blackberries, you need to understand their unique growing habit first.
These plants are thornless and produce fruit on canes that grow in their first year, then fruit in their second year.
So the way you prune triple crown blackberries centers on managing those first-year canes and removing the older ones after they finish fruiting.
If you get this right, you’ll enjoy bigger harvests and healthier plants year after year.
In this post, we’ll walk through exactly how to prune Triple Crown blackberries step by step, from late winter through summer and fall.
Let’s get started.
Why You Need to Prune Triple Crown Blackberries
Pruning triple crown blackberries isn’t just a chore—it’s the secret to a productive patch.
Here’s why it matters so much.
1. They Are Floricane-Bearing
Triple Crown blackberries are floricane-bearing, which means only the second-year canes produce fruit.
If you never prune triple crown blackberries, those old canes will crowd out the new ones and your harvest will shrink.
By cutting away the spent floricanes, you make room for fresh primocanes that will fruit next season.
2. Better Airflow Means Less Disease
When you prune triple crown blackberries properly, you open up the canopy.
Good airflow reduces the chance of fungal problems like anthracnose and botrytis.
That’s a big deal because Triple Crown plants can get quite dense if left alone.
3. Easier Harvesting and Bigger Berries
A well-pruned triple crown blackberry plant directs energy into fewer, stronger canes.
The result is larger, sweeter berries and canes that are easier to reach when you pick.
Trust me, once you learn how to prune Triple Crown blackberries, you’ll never skip it again.
When to Prune Triple Crown Blackberries
Timing is everything when you prune triple crown blackberries.
You’ll actually do most of the work in late winter or early spring while the plants are still dormant.
That’s the best time to prune triple crown blackberries because the canes are leafless and you can see exactly what you’re doing.
You’ll also do a bit of summer pruning right after harvest.
1. Late Winter Pruning (Main Job)
In late winter, remove any canes that fruited last year.
These floricanes will look gray, woody, and maybe a bit brittle.
Cut them right down to the ground.
Then thin the remaining new canes so they stand about 4 to 6 inches apart.
This is the core step when you prune triple crown blackberries.
2. Summer Pruning After Harvest
Once you’ve picked the last berry in summer, go ahead and cut out the floricanes that just finished.
This frees up space and sunlight for the new primocanes that are already growing.
It also helps you stay ahead of pests and diseases.
3. Tip Pruning in Late Spring
When your new primocanes reach about 4 to 5 feet tall, pinch or cut off the top few inches.
This encourages side branches, which will produce more fruit next year.
It’s a simple trick that pays off big when you prune triple crown blackberries.
How to Prune Triple Crown Blackberries Step by Step
Now let’s get into the actual process so you can prune triple crown blackberries with confidence.
1. Gather Your Tools
You’ll need a pair of sharp bypass pruners, a pair of loppers for thicker canes, and thick gloves.
Even though Triple Crown is thornless, gloves still protect you from scratches and sap.
Clean your tools with rubbing alcohol before you start.
2. Identify Floricanes vs. Primocanes
Floricanes are the canes that fruited this past season—they’re usually darker and have spent laterals.
Primocanes are the new, green, vigorous canes that will fruit next year.
When you prune triple crown blackberries, you remove floricanes and keep primocanes.
3. Remove Dead, Damaged, and Spent Canes
Start by cutting out any dead, broken, or diseased canes.
Then remove all floricanes at ground level.
Don’t leave stubs—they invite pests.
4. Thin the Primocanes
Keep the strongest 5 to 7 primocanes per plant.
Space them evenly around the trellis or wire.
Cut the rest at ground level.
This is the heart of how to prune Triple Crown blackberries for maximum yield.
5. Shorten Side Branches
On the canes you keep, trim side branches back to about 12 to 18 inches.
This keeps the plant manageable and encourages bigger berries.
6. Tie Canes to a Trellis
After you prune triple crown blackberries, secure the remaining canes to your trellis.
Use soft ties or twine so you don’t damage the bark.
This keeps the canes upright and makes harvesting a breeze.
7. Dispose of Debris
Burn or bag the pruned canes—don’t compost them if disease was present.
Cleaning up after you prune triple crown blackberries prevents problems from spreading.
Common Mistakes to Avoid When You Prune Triple Crown Blackberries
Even experienced gardeners slip up sometimes.
Watch out for these pitfalls.
1. Cutting Too Much at Once
If you remove more than a third of the plant, you stress it.
Prune triple crown blackberries gradually and stick to the plan.
2. Pruning at the Wrong Time
Pruning in late fall can trigger new growth that winter kills.
Stick to late winter and post-harvest summer for best results when you prune triple crown blackberries.
3. Leaving Floricanes Behind
Old canes won’t fruit again, and they sap energy.
Remove them every year when you prune triple crown blackberries.
4. Not Sharpening Your Tools
Dull pruners crush canes and invite disease.
Sharpen before you prune triple crown blackberries.
5. Skipping the Trellis
Unsupported canes flop and break.
A simple two-wire trellis makes pruning and picking much easier.
So, How Do You Prune Triple Crown Blackberries?
You prune Triple Crown blackberries by removing spent floricanes in late winter, thinning new primocanes to 5–7 per plant, tip-pruning in late spring, and cleaning up after harvest.
It’s a rhythm that rewards you with healthier plants and a bigger crop every single year.
Stick with it, and your Triple Crown patch will thrive.