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To trellis thornless blackberries, you need to provide a sturdy support system that keeps the canes off the ground and makes harvesting easy.
Thornless blackberries grow vigorously, and without a proper trellis, those long canes will sprawl everywhere, making them hard to manage.
The good news is that trellising thornless blackberries isn’t complicated, and once your system is up, it’ll serve you for years.
In this post, we’ll walk through how to trellis thornless blackberries step by step, including the best trellis types, when to set them up, and how to train the canes properly.
Let’s dig in.
Why You Should Trellis Thornless Blackberries
Trellising thornless blackberries is essential for a healthy, productive patch.
Here’s why it matters so much:
1. Better Airflow and Sunlight
When you trellis thornless blackberries, you lift the canes up where air can move freely around them.
Good airflow reduces the risk of fungal diseases like anthracnose and botrytis, which thrive in damp, crowded conditions.
Sunlight also reaches more of the plant, which means sweeter berries and healthier growth.
2. Easier Harvesting
A well-trellised thornless blackberry patch makes picking a breeze.
The berries hang at a comfortable height, so you’re not bending or crawling through a tangled mess.
Even though thornless blackberries lack thorns, untangled canes still scratch and snag if they’re left to run wild.
3. Simplified Pruning and Maintenance
When you trellis thornless blackberries, you can clearly see which canes are new and which are old.
That makes pruning way easier because you know exactly what to cut and what to keep.
It also keeps your rows neat, so mowing and weeding between plants becomes much simpler.
Choosing the Best Trellis for Thornless Blackberries
There are several ways to trellis thornless blackberries, and the right choice depends on your space and how many plants you’re growing.
Here are the most common options:
1. The T-Bar Trellis
The T-bar trellis is a classic choice for thornless blackberries.
You drive a sturdy post into the ground and attach a horizontal crossbar near the top, forming a T shape.
Then you run wires along both sides of the crossbar to hold the canes.
This design works great because it separates fruiting canes from new growth, keeping everything organized.
2. The Two-Wire Trellis
A simple two-wire trellis is another easy way to trellis thornless blackberries.
You set posts every 15 to 20 feet and string two or three wires between them at different heights.
This is a low-cost option that works well for smaller patches and is simple to build in an afternoon.
3. The V-Trellis
If you want maximum airflow, the V-trellis is a fantastic option for thornless blackberries.
Two angled posts form a V shape, and wires run along each side.
This opens up the center of the plant, which reduces disease and makes harvesting even easier.
How to Trellis Thornless Blackberries Step by Step
Now let’s get into the actual process of how to trellis thornless blackberries.
Follow these steps and you’ll have a solid system in place:
1. Set Your Posts Before Planting
The best time to install your trellis is before you plant your thornless blackberries.
Space your posts 15 to 20 feet apart and set them at least 2 feet deep into the ground.
Use pressure-treated wood or metal posts that won’t rot or bend under the weight of heavy canes.
2. Add Wires at the Right Heights
For thornless blackberries, run your first wire about 3 feet off the ground and your top wire around 5 to 6 feet high.
This gives you room to train canes at different levels, which keeps the plant tidy and productive.
Use 12- or 14-gauge wire and tighten it well so it doesn’t sag under the load.
3. Train the Canes as They Grow
As your thornless blackberries grow, gently weave the canes along the wires.
Don’t force them into sharp bends, just guide them in the direction you want them to go.
You can use soft ties or twine to hold them in place, but avoid anything that cuts into the cane.
4. Separate First-Year and Second-Year Canes
Thornless blackberries produce fruit on second-year canes, so keep the new growth separate from the fruiting canes.
Train the new canes along the lower wires and let the fruiting canes run along the top.
This makes pruning after harvest much easier, and it keeps your trellis from turning into a jungle.
Tips for Trellising Thornless Blackberries Successfully
A few extra pointers will help you get the most out of your trellis:
1. Prune After Harvest
Once you’ve picked your berries, cut the old fruiting canes back to the ground.
This keeps your thornless blackberries from wasting energy on canes that won’t produce again.
2. Don’t Let Canes Tip-Root
Thornless blackberries can tip-root if the cane tips touch the soil.
Keep them off the ground and you’ll avoid unwanted new plants popping up everywhere.
3. Check Your Trellis Each Spring
Tighten wires and replace any broken posts before the growing season starts.
A little maintenance now saves you a lot of trouble later when those canes get heavy with fruit.
So, How Do You Trellis Thornless Blackberries?
You trellis thornless blackberries by setting sturdy posts, running wire at multiple heights, and training the canes to grow along those wires.
It keeps your plants healthy, makes harvesting a pleasure, and turns a wild bramble into a neat, productive patch.
Whether you choose a T-bar, two-wire, or V-trellis, the key is to start early and stay consistent with training and pruning.
With a solid trellis in place, your thornless blackberries will reward you with bigger harvests and far less frustration.