Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
Yes, you can prune blackberries in the summer, but it’s not the main pruning session you should rely on for a healthy crop.
Summer pruning for blackberries is all about maintenance and keeping your plants in check, not about heavy, structural cuts.
In this post, we’ll explore why summer pruning is beneficial, exactly when and how to do it, and the key differences between pruning summer-bearing and fall-bearing varieties.
Let’s dig into the details of summer blackberry care.
Why You Can Prune Blackberries in the Summer
Blackberries are vigorous growers, and during the summer months, they can quickly turn into a tangled mess of canes.
Summer pruning helps you manage this growth by focusing on the current season’s new canes, which are called primocanes.
By pruning these primocanes in the summer, you encourage them to branch out and become stronger for the next year’s fruiting.
This type of pruning also improves air circulation, which reduces the risk of fungal diseases that love humid, crowded conditions.
So, when you prune blackberries in summer, you’re not just tidying up, you’re also setting the stage for a more productive harvest next year.
Here are the main reasons why summer is a great time for this kind of blackberry care.
1. Controlling Vigorous New Growth
During summer, blackberry plants are in their peak growing mode, sending up long, whip-like canes that can grow several inches in a single day.
If you leave these canes alone, they can become unwieldy and flop over under their own weight.
When you prune blackberries in the summer, you’re cutting these tall canes back to a manageable height.
This forces the plant to put energy into creating lateral branches, which is exactly where the fruit buds will form next year.
This simple step makes the plant much easier to manage and harvest from later.
2. Improving Sunlight Penetration
Blackberries need plenty of sunlight to ripen their fruit and produce healthy canes.
Dense summer growth can shade the lower parts of the plant, leading to poor fruit production and weak, spindly canes.
By selectively removing some of the new growth, you open up the center of the plant.
This lets sunlight reach all parts of the blackberry bush, which helps the fruit that’s currently ripening and strengthens the canes for next season.
Sunlight is a key ingredient for sweet, plump berries, so summer pruning is a direct way to boost fruit quality.
3. Enhancing Airflow to Prevent Disease
Humidity and stagnant air are the perfect breeding grounds for diseases like botrytis and anthracnose, which can devastate a blackberry patch.
When you prune blackberries in summer, you’re thinning out the canopy, allowing breezes to flow through the plant.
This dries out the leaves and canes quickly after rain or dew, which is crucial for preventing fungal spores from taking hold.
Healthier foliage means the plant can photosynthesize more efficiently, leading to a stronger, more resilient blackberry plant overall.
How to Prune Blackberries in Summer (Step-by-Step)
Now that you know why you should do it, let’s talk about the actual method for summer pruning.
The technique is mostly the same for all types of blackberries, but there are a few differences based on whether you have floricane-fruiting (summer-bearing) or primocane-fruiting (fall-bearing) varieties.
Here’s a simple guide to get you started.
1. Identify Your Canes
First, you need to know which canes are which because you prune them differently.
Floricanes are the brown, woody canes from last year that are currently fruiting this summer.
Primocanes are the new, green, flexible canes that grew this spring and are not producing fruit yet.
For summer-bearing blackberries, you will focus your pruning on the primocanes.
For fall-bearing types, you have a different option, which we’ll cover in a moment.
2. Tip the Primocanes
When a primocane reaches about 3 to 4 feet tall, use a clean pair of pruning shears to snip off the top 2 to 3 inches of the cane.
This is called “tipping” and it’s the most common summer pruning task.
Tipping encourages the cane to stop growing upward and instead send out lateral shoots from the nodes just below the cut.
These lateral shoots are what will bear fruit next year, so you’re essentially creating a branching structure for a bigger harvest.
3. Remove Weak or Damaged Canes
While you’re at it, take a look at the base of the plant and remove any canes that are thin, spindly, or showing signs of disease or damage.
You should also cut away any canes that are growing in the wrong direction or crossing over each other.
This helps keep the plant’s energy focused on the strongest, most productive canes.
Aim to keep about 4 to 6 of the strongest primocanes per plant for next year’s growth.
4. Don’t Touch the Floricanes (Yet)
As we mentioned, the floricanes are the ones currently fruiting, so you should leave them alone during early summer.
Once they finish producing berries, you will remove them completely, but that’s a late summer or early fall pruning task.
For now, during the main summer season, your focus is on shaping the new growth.
Pruning Summer-Bearing vs. Fall-Bearing Blackberries
The timing and method for summer pruning can vary slightly depending on the type of blackberry you have.
Understanding this difference is crucial so you don’t accidentally cut off your future fruit.
1. Summer-Bearing (Floricane-Fruiting)
These varieties produce fruit on last year’s canes, meaning the floricanes are what give you berries in early summer.
For these plants, summer pruning is just for the primocanes.
You are simply tipping them to encourage branching for next year.
You do not cut back the floricanes until after they have finished producing fruit.
2. Fall-Bearing (Primocane-Fruiting)
These varieties are a bit different because they can produce fruit on the tips of the current year’s primocanes in late summer or fall.
If you prune blackberries in the summer for these types, you have a choice.
You can skip pruning altogether to get that early fall crop.
Or, you can tip the primocanes in early summer, which will give you a later but larger harvest on the lateral branches.
Many growers prefer to skip summer tipping on fall bearers and just cut all canes to the ground in early winter for a single, large fall crop.
So, Can You Prune Blackberries in the Summer?
Yes, you can prune blackberries in the summer, and it’s a vital practice for maintaining a healthy and productive patch.
Summer pruning focuses on the new, green primocanes, and the main goal is to tip them to encourage branching.
This simple act of summer pruning helps control height, improves sunlight penetration, and enhances airflow.
The best time to do this is once the primocanes reach the desired height, usually from late June through July.
If you have summer-bearing blackberries, you’ll also be removing the spent floricanes after their harvest, which typically happens in late summer.
Just remember to keep your shears clean and sharp, and always cut just above a healthy bud to promote strong new growth.
So, when you’re out in the garden this summer, don’t hesitate to prune blackberries.
Your future harvest will thank you for giving the plant this extra attention.