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You take care of thornless blackberries by giving them full sun, well-drained soil, and a sturdy trellis to keep the canes off the ground.
Unlike their wild, prickly cousins, thornless blackberries are a joy to grow because you can harvest them without getting scratched up.
If you’ve been wondering how do you take care of thornless blackberries, the good news is that they’re actually pretty forgiving once they’re established.
They just need a little structure, regular water, and annual pruning to keep producing those sweet, juicy berries year after year.
In this post, we’ll walk through everything you need to know about taking care of thornless blackberries, from planting and watering to pruning and winter protection.
Let’s dig in.
How Do You Take Care of Thornless Blackberries? Here’s the Breakdown
Taking care of thornless blackberries starts with understanding what they need at every stage of growth.
These plants are perennials, meaning they come back every year, but their canes only live for two seasons.
That cycle shapes almost everything about how you take care of them.
1. Sunlight and Soil Are Non-Negotiables
Thornless blackberries need at least six to eight hours of direct sunlight every day.
The more sun they get, the sweeter your harvest will be.
As for soil, they love a spot that drains well and holds moisture without staying soggy.
If your soil is heavy clay, mix in some compost or plant them in raised beds so the roots don’t sit in water.
A soil pH between 5.5 and 6.5 is ideal for thornless blackberries.
2. Watering Consistently Matters More Than You Think
When you take care of thornless blackberries, watering is where a lot of growers slip up.
These plants want about one to two inches of water per week, especially while the fruit is forming.
Drip irrigation is the easiest way to keep the soil evenly moist without soaking the leaves.
Wet foliage invites fungal diseases, so always water at the base of the plant.
During hot, dry spells, check the top inch of soil and water whenever it feels dry to the touch.
3. Mulch to Keep Moisture In and Weeds Out
A two to three inch layer of mulch around your thornless blackberries does wonders.
It locks in moisture, keeps the roots cool, and smothers the weeds that compete for nutrients.
Use straw, pine bark, or shredded leaves and keep the mulch a few inches away from the canes themselves.
That little gap prevents rot from creeping in at the base of the plant.
Pruning and Training Thornless Blackberries
If taking care of thornless blackberries has one tricky part, it’s pruning.
Get this right and your plants will reward you with bigger, better berries every single year.
1. Understand Primocanes and Floricanes
Thornless blackberries grow two types of canes: primocanes and floricanes.
Primocanes are the fresh, first-year growth, and floricanes are the same canes in their second year, which is when they flower and fruit.
Once a floricane finishes fruiting, it dies and should be removed.
2. Prune at the Right Time
The best time to prune thornless blackberries is late winter or early spring while the plants are still dormant.
Cut out any dead, damaged, or diseased canes first.
Then thin the remaining floricanes so they’re about four to six inches apart.
In summer, after harvest, cut the spent floricanes down to the ground to make room for new growth.
3. Tip Primocanes to Encourage Branching
When your primocanes reach about three to four feet tall, pinch or cut off the top few inches.
This forces the plant to grow side branches, and those branches are where next year’s berries will form.
It’s a small step that makes a huge difference in your harvest.
4. Train Canes Onto a Trellis
Thornless blackberries stay healthier when their canes are lifted off the ground.
A simple T-trellis with wires spaced about a foot apart works beautifully.
Weave the canes along the wires as they grow, and you’ll get better airflow, less disease, and easier picking.
Feeding, Pests, and Winter Care for Thornless Blackberries
Beyond water and pruning, a few more habits keep thornless blackberries thriving.
Fertilize in early spring with a balanced berry fertilizer or a layer of compost.
Avoid overfeeding with nitrogen, since that grows lots of leaves but few berries.
Watch for common pests like aphids, spider mites, and spotted wing drosophila, and treat them early with insecticidal soap or row covers.
Good airflow and clean pruning practices prevent most fungal issues like anthracnose and cane blight.
In colder zones, mulch heavily around the base in late fall to protect the roots through winter.
So, How Do You Take Care of Thornless Blackberries?
You take care of thornless blackberries by planting them in full sun with well-drained soil, watering them consistently, mulching around the base, and pruning them properly each year.
Train the canes onto a trellis, feed them lightly in spring, and protect the roots over winter.
Do those things, and taking care of thornless blackberries becomes one of the easiest and most rewarding parts of your garden.
Before you know it, you’ll be filling buckets with sweet berries and wondering why you didn’t plant them sooner.