How To Make A Trellis For Blackberries [Complete Guide]

If you’re a blackberry lover and want to grow your own plants, creating a trellis is a great way to support your blackberries and help them grow strong and healthy. A trellis can help keep your plants upright, prevent them from drooping, and make harvesting much easier.

While you can purchase a ready-made trellis, building one yourself can be a fun and rewarding project. In this guide, we’ll take you through the process of building a trellis for blackberries, so you can enjoy a bountiful harvest of these delicious fruits.

What Is The Blackberry Trellis Systems?

A blackberry trellis system is a structure that supports and trains blackberry plants as they grow. It usually includes posts, wires, and sometimes crossbars or additional support poles, arranged in a specific configuration to create a framework for the plants to climb and grow upon.

The main goal of a blackberry trellis system is to encourage upward growth of the plants, rather than having them sprawl outward across the ground. This helps to increase the plant’s yield by allowing more space for fruit growth and making harvesting easier. Additionally, the trellis system can improve air circulation around the plants, reducing the risk of disease and pests.

There are various blackberry trellis systems suitable for different sizes and layouts of growing areas and blackberry cultivars. Some common trellis systems include single-wire trellises, V-trellises, T-trellises, and bi-parting trellises.

A blackberry trellis system must be sturdy and strong enough to withstand the weight of the plants as they grow and produce fruit. Proper training of the blackberry canes onto the trellis is also important to ensure orderly and productive plant growth. With appropriate care and maintenance, a well-designed blackberry trellis system can offer numerous years of productive growth for blackberry plants.

Materials Needed

Building a Blackberry trellis system requires several materials. Here is a list of the common materials needed for building a trellis system for blackberries:

  1. Garden gloves with textured palms: It is always a good idea to protect your hands while working in the garden, and gloves with textured palms can provide a better grip when handling tools and materials.
  2. Post-hole digger: This is an essential tool for creating the necessary holes to support the posts of your trellis.
  3. Pressure-treated wood posts: Pressure-treated wood is resistant to rot and decay and will last longer than untreated wood.
  4. Shovel: A shovel is necessary for backfilling soil, gravel, or sand into your post holes.
  5. Measuring tape: Precise measurements are critical to building a sturdy and functional trellis, so a measuring tape is essential.
  6. Wire: High-tensile, galvanized steel wire with a diameter of 12 or 14 gauge is recommended for creating the support system for your Blackberry canes.
  7. Staple gun: A staple gun is the best tool for securing the wire to posts, and it is quicker and easier than using nails or screws.
  8. Stainless steel staples: Stainless steel staples are more resistant to rust and corrosion than other types of staples and will last longer.
  9. Wire cutter: A wire cutter is necessary to cut the wire to the proper length and to trim excess wire.
  10. Saw: A saw is required to cut your lumber or metal poles to the right dimensions.
  11. Chalk or marker: Use a chalk or marker to mark measurements properly, which will help you avoid mistakes and create a straight and level trellis.
  12. Electric drill: An electric drill is required to create holes for screws and to secure screws to your trellis.
  13. Gravel or sand: Gravel or sand is necessary for backfilling into the post holes to provide a stable foundation for the posts.
  14. Wood treatment: Applying a wood treatment can help protect the wood from moisture, insects, and decay, extending the life of the trellis.
  15. Concrete: Concrete is used to secure the posts in the ground. Each post should be set in a hole that is at least 2 feet deep and 1 foot wide, with the bottom of the hole filled with 6 inches of gravel to aid drainage. The post should then be set in the hole and surrounded by concrete.

These 15 tools and materials should be sufficient for building a functional and sturdy Blackberry trellis system. Depending on the specific design and materials used, you may require additional tools or materials, but the items listed above should cover the basics.

Choosing the Right Location

Choosing the right location is the first step in building a Blackberry trellis system. Consider the following factors when selecting a location:

1 – Sun Exposure

Blackberries require full sun exposure for optimal growth and fruit production. Look for an area that receives at least 6-8 hours of direct sunlight per day. If possible, choose a spot with morning sun and afternoon shade to prevent overripe berries and sunscalds.

2 – Soil Quality

Blackberries prefer well-draining soil that is rich in organic matter. Avoid areas with heavy clay soil or poor drainage, which can lead to root rot. Improve soil quality by adding compost or aged manure to the planting area.

3 – Access to Water

Blackberries require regular watering, especially during the growing season. Make sure there is access to a reliable water source, such as a nearby hose or irrigation system.

4 – Space Requirements

Blackberry plants can grow quite large, with trailing canes that can reach up to 10 feet in length. Plan your trellis system accordingly to accommodate the plants and their sprawling canes.

5 – Other Considerations

Consider wind exposure, pests and diseases, accessibility for pruning and maintenance, and aesthetic appeal when selecting a location for your Blackberry trellis system. Avoid excessively windy or exposed areas, areas with a history of pest or disease problems, and locations that are difficult to access. Choose a location that fits in with the overall design of your garden or landscape.

Trellis Design Options

When it comes to building a blackberry trellis system, there are various design options to consider. Your choice of design will depend on factors such as available space, the number of plants to be grown, and personal preference. Here are some of the most common trellis designs for blackberries:

T-shaped Trellis:

A T-shaped trellis is a popular choice for blackberries as it provides sturdy support and easy access to the berries.

To build this trellis, you will need two pressure-treated wood posts (8-10 feet tall), a horizontal crossbar (2×4 or 4×4), and high-tensile, galvanized steel wire (12 or 14 gauge).

First, dig two post holes approximately 2 feet deep and 8-10 feet apart, set the posts in the holes, and backfill with gravel or sand.

Attach the horizontal crossbar to the top of the posts using lag screws or carriage bolts, then run two wires horizontally between the posts, one at approximately 3 feet and the other at approximately 6 feet above the ground.

Run additional wires vertically from the top wire down to the ground, spacing them approximately 1-2 feet apart.

V-shaped Trellis:

A V-shaped trellis is another popular option, especially for gardeners with limited space. This design allows for more plants to be grown in a smaller area and also provides good air circulation and sunlight exposure for the berries.

To build this trellis, dig two post holes approximately 2 feet deep and 6-8 feet apart, set the posts in the holes, and backfill with gravel or sand. Attach a horizontal crossbar (2×4 or 4×4) to the top of each post using lag screws or carriage bolts, then run a wire between the two crossbars to create a V-shape.

Run additional wires vertically from the top wire down to the ground, spacing them approximately 1-2 feet apart.

Fence-style Trellis:

A fence-style trellis involves running wires vertically between two fence posts or other support structures, with the plants trained to grow along the wires. To build this trellis, install two fence posts or other support structures approximately 8-10 feet apart.

Run high-tensile, galvanized steel wire (12 or 14 gauge) vertically between the posts, spacing them approximately 1-2 feet apart, and attach the wires to the posts using fence staples or other fasteners. Train the blackberry canes to grow along the wires using plant ties or twine.

Single Wire Trellis:

A single wire trellis is a simple and cost-effective option for growing blackberries. This design involves running a single wire between two support structures and training the plants to grow along the wire.

To build this trellis, install two support structures (such as wood posts or metal poles) approximately 8-10 feet apart.

Run a high-tensile, galvanized steel wire (12 or 14 gauge) between the two supports, approximately 3-4 feet above the ground. Attach the wire to the supports using wire clips or other fasteners and train the blackberry canes to grow along the wire using plant ties or twine.

Maintenance and Upkeep

To ensure the longevity of your blackberry trellis and promote healthy plant growth, it’s important to keep up with proper maintenance and upkeep.

Here are some tips to follow:

  1. Regularly check for damage: Periodically inspect your trellis for any damage, such as broken wires or loose posts, and make necessary repairs or replacements promptly to prevent further damage.
  2. Prune regularly: Regular pruning is crucial to prevent overcrowding and promote healthy growth. Remove any dead or diseased canes, and prune away any canes that are growing in the wrong direction or crossing over others.
  3. Fertilize as needed: Blackberry plants require regular fertilization to promote fruit production and healthy growth. Apply a balanced fertilizer in spring and after harvesting, following the manufacturer’s instructions.
  4. Mulch around the base: Mulching around the base of your plants can help retain moisture and suppress weeds. Apply a layer of mulch, such as straw or wood chips, to a depth of 2-3 inches.
  5. Water regularly: Blackberry plants need consistent watering, especially during dry periods. Water deeply and avoid overwatering to prevent waterlogging.
  6. Train the canes: As blackberry canes grow, train them to grow along the trellis wires by tying them loosely with garden twine. This helps keep the plants upright and prevents tangling or damage.
  7. Adjust the trellis: As plants grow and produce fruit, you may need to adjust the spacing of wires and the height of the crossbar to accommodate their growth.

By following these maintenance tips, you can promote the health and productivity of your blackberry plants and trellis for many years to come.


How Long Will My Blackberry Trellis Last?

The lifespan of your blackberry trellis depends on various factors, such as the quality of materials used, weather conditions, and the amount of maintenance it receives. A well-constructed trellis made with durable materials, such as pressure-treated wood, can last for 10-15 years or longer with proper care and maintenance.

What is the best trellis system for blackberries?

The best trellis system for blackberries is a simple two-wire system. This design consists of two parallel wires, one at 3 feet and the other at 5 feet, with a crossbar at the top to provide stability. This system allows for easy training of the canes and provides adequate support for the plants as they grow and produce fruit.

Do thornless blackberries need a trellis?

Thornless blackberries still require a trellis for support and proper growth. Without a trellis, the plants can become tangled and overcrowded, making it difficult to harvest the fruit and leading to poor yields.

Are blackberries hard to control?

Blackberries can be difficult to control if they are allowed to grow unchecked. Regular pruning and maintenance are important to prevent the plants from becoming invasive and taking over an area. However, with proper management and care, blackberries can be a productive and delicious addition to any garden.

How Tall Should a Blackberry Trellis Be?

The height of your blackberry trellis will depend on the variety of blackberry you are growing and how tall it typically grows. As a general rule, the trellis should be at least 6 feet tall to accommodate most varieties. However, taller trellises may be needed for some varieties that can grow up to 10 feet or more.


Building a blackberry trellis is a great way to support and train your plants for optimal growth and fruit production. By following this guide instructions and tips, you can create a sturdy, functional trellis that will provide your blackberry plants with the support they need to thrive

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