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What to do with blackberry plants in the fall is actually pretty simple once you know the steps.
Fall is the perfect time to give your blackberry plants some attention because they’re winding down for the season.
The cool weather slows their growth, which means it’s the ideal window to prune, feed, and prep them for winter.
If you’ve been wondering what to do with blackberry plants in the fall, you’re in the right place.
In this post, we’ll walk through exactly what to do with blackberry plants in the fall so they come back stronger next year.
Let’s dig in.
What to Do with Blackberry Plants in the Fall: The Main Tasks
When you’re figuring out what to do with blackberry plants in the fall, these core tasks should be at the top of your list.
1. Prune Away the Old Canes
The first thing to do with blackberry plants in the fall is to prune out the canes that already produced fruit.
Blackberries grow on what’s called floricanes, which are second-year canes that fruit once and then die.
Once you’ve harvested this year’s berries, those canes won’t produce again, so leaving them just wastes the plant’s energy.
Cut them down to the ground and toss them in the trash rather than the compost to avoid spreading disease.
2. Trim the New Canes
The next thing to do with blackberry plants in the fall is to trim the new canes, also known as primocanes.
These are the green canes that grew this year and will produce fruit next season.
You’ll want to cut them back to around four or five feet tall to encourage branching.
For trailing varieties, you can also tip them back so they stay manageable through winter.
3. Clean Up Around the Base
Fall is also the time to clean up fallen leaves and old debris around the base of your blackberry plants.
This reduces the chances of pests and diseases overwintering in the soil.
Rake away any old mulch and replace it with a fresh layer to keep things tidy.
Feeding and Soil Prep for Blackberry Plants in the Fall
Your blackberry plants need a little support before winter sets in, and fall is a great time to give it.
1. Skip the Nitrogen Fertilizer
One thing to avoid when thinking about what to do with blackberry plants in the fall is giving them nitrogen-rich fertilizer.
Nitrogen pushes new growth, and new growth is vulnerable to frost damage.
Instead, hold off on feeding until early spring.
2. Add Compost or Aged Manure
What you can do with blackberry plants in the fall is add a layer of compost or aged manure around the base.
This feeds the soil slowly through winter without forcing new top growth.
Spread a two to three inch layer, keeping it a few inches away from the canes.
3. Test and Adjust Soil pH
Fall is a good time to check the pH of your soil since you’ll have months before spring to adjust it.
Blackberries prefer slightly acidic soil with a pH between 5.5 and 6.5.
If your soil is off, add sulfur to lower pH or lime to raise it now so it has time to work.
Protecting Blackberry Plants in the Fall for Winter
Winter can be tough on blackberry plants, so fall is your chance to shield them from the cold.
1. Water Deeply Before the First Freeze
Giving your blackberry plants a deep watering in late fall helps them survive the winter.
Moist soil holds heat better than dry soil, which protects the roots from freezing.
Water thoroughly a few weeks before your first expected frost.
2. Mulch Heavily Around the Roots
Mulching is one of the most useful things to do with blackberry plants in the fall.
A thick layer of straw, wood chips, or leaves insulates the roots and keeps soil temperature steady.
Pile on four to six inches, but keep it slightly away from the canes to prevent rot.
3. Consider Row Covers in Cold Climates
If you live somewhere with harsh winters, another option for what to do with blackberry plants in the fall is to use row covers.
These fabric covers protect canes from drying winds and extreme cold snaps.
Just make sure to remove them once the danger of frost has passed in spring.
So, What to Do with Blackberry Plants in the Fall?
What to do with blackberry plants in the fall comes down to pruning, cleaning, and protecting them before winter hits.
Prune out the old canes, trim the new ones, and clean up the area to set your plants up for a healthy season.
Skip the nitrogen, add compost, and mulch heavily to keep the roots cozy.
Do these things, and your blackberry plants will reward you with a bigger harvest next year.