How To Prune Thornless Blackberries In Spring

You can prune thornless blackberries in spring, and doing it at the right time sets your plants up for a huge harvest.
 
The key is to prune them before new growth takes off, while the canes are still dormant or just beginning to wake up.
 
If you’ve been wondering how to prune thornless blackberries in spring, don’t worry, it’s actually one of the easiest berry jobs you’ll do all year.
 
Unlike their thorny cousins, thornless blackberries won’t fight you back, so you can work quickly and comfortably.
 
In this post, we’ll walk through exactly how to prune thornless blackberries in spring, which canes to cut, which ones to keep, and the common mistakes that cost you berries.
 
Let’s dig in.
 

Why You Should Prune Thornless Blackberries in Spring

Pruning thornless blackberries in spring matters because these plants fruit on second-year canes, and those canes need room, light, and airflow to produce well.
 
If you skip pruning, your thornless blackberries turn into a tangled mess, and tangled canes mean fewer berries and more disease.
 
Here’s why spring pruning pays off:
 

1. It Directs Energy to the Right Canes

Thornless blackberries grow two types of canes: primocanes (first-year canes) and floricanes (second-year canes that fruit).
 
When you prune thornless blackberries in spring, you remove the canes that already fruited last season so the plant pours energy into the new floricanes instead.
 
That means bigger, sweeter berries instead of wasted growth.
 

2. It Boosts Airflow and Sunlight

Thornless blackberries that are crowded become a breeding ground for fungal issues like anthracnose and cane blight.
 
Pruning opens up the canopy so air moves through and sunlight reaches every fruiting branch.
 
Healthy airflow is honestly half the battle when you grow thornless blackberries.
 

3. It Keeps Plants Manageable

Thornless blackberries can sprawl several feet in every direction if you let them.
 
Spring pruning keeps them contained, supported, and easy to pick from later in the season.
 
Trust me, your back will thank you at harvest time.
 

How to Prune Thornless Blackberries in Spring Step by Step

Now let’s get into the actual process of how to prune thornless blackberries in spring.
 
Grab a pair of sharp bypass pruners, some gloves (even thornless varieties have rough stems), and a bucket for clippings.
 

1. Remove Dead and Damaged Canes First

Start by cutting out any canes that are dead, broken, or diseased.
 
Dead canes on thornless blackberries look gray or brown and snap easily, while healthy canes stay green or reddish-brown and bend without breaking.
 
This first pass makes it much easier to see what you’re working with.
 

2. Cut Out the Old Floricanes

The canes that produced fruit last year won’t produce again, so they have to go.
 
These older canes look thicker and woodier than the new growth.
 
Cut them right down at ground level when you prune thornless blackberries in spring.
 
If you leave them, they’ll just sap energy and crowd out the canes that actually matter.
 

3. Thin the New Canes

Once the old canes are gone, thin out the primocanes so only the strongest ones remain.
 
Aim for about four to six healthy canes per plant when you prune thornless blackberries.
 
Keep the thickest, most upright canes and remove the weak, spindly ones.
 
Good spacing between canes is what makes spring pruning worthwhile.
 

4. Tip the Canes to Encourage Branching

If your thornless blackberries are growing on a trellis, tip the canes by cutting off the top few inches.
 
This forces the plant to push out side branches, and those side branches are where the berries form.
 
Do this when canes reach about four to five feet tall.
 
It’s one of the simplest tricks for a bigger yield from thornless blackberries.
 

5. Tie Remaining Canes to the Trellis

After you prune thornless blackberries in spring, secure the canes loosely to your trellis wires.
 
Space them a few inches apart so each one gets its own share of light.
 
Don’t bunch them together, or you’ll undo all your hard work.
 

Common Mistakes When Pruning Thornless Blackberries in Spring

A few slip-ups can cost you the season, so watch out for these.
 

1. Pruning Too Late

Prune thornless blackberries too late and you risk cutting off buds that were about to bloom.
 
Aim to finish before the plant starts actively flowering.
 

2. Removing All the New Canes

Some folks get overzealous and cut everything down, but that means no berries next year.
 
Always leave a few strong primocanes when you prune thornless blackberries.
 

3. Forgetting to Disinfect Your Tools

Clean pruners between cuts, especially after touching diseased canes, so you don’t spread problems.
 
A quick wipe with rubbing alcohol does the trick.
 

So, How Do You Prune Thornless Blackberries in Spring?

You prune thornless blackberries in spring by cutting out dead canes, removing old floricanes, thinning the new primocanes, tipping them for branching, and tying the rest to a trellis.
 
This simple routine keeps your thornless blackberries healthy, productive, and easy to manage all season long.
 
Get it done early in the season and you’ll be rewarded with baskets full of berries by summer.
 
Happy pruning.