How to Build a Freestanding Garden Trellis
A garden trellis is one of the few landscaping elements that blankets itself with flowers and foliage. A garden trellis brings a welcome sense of peace and serenity to your property.
With basic tools, inexpensive materials, and a free day or two, you can build a simple garden trellis that will add grace and charm to your home. Because a garden trellis slowly grows over time as it hosts beautiful flowers, vegetables, and vines, it ages well and can add long-term value to your property.
A trellis is a horizontal structure meant to support vines and other vegetation on lattice work. A freestanding trellis is not attached to the side of the house.
Before You Begin
With this project, you'll learn how to build one section of trellis that is 8 feet long and about 6 feet high. This is an entirely scalable project, too. For a longer trellis, simply add more 8-foot sections.
Adopting a few qualities of a boundary fence, this garden trellis stands independent of other structures. This is a significant advantage over trellises that are built on the side of a house, as creeping vegetation can harm a house's exterior siding.
You may wish to position the trellis westward or southward so that the plants can gain better sun. Or if you like the look of a trellis against a house, you can erect the trellis a foot or two away from the house. You get the same visual effect with none of the damage that comes with plant-to-house contact.
Check with your local permitting office about permits for building a garden trellis in your yard. Some communities may consider a trellis to be a fence or part of a fence, which may trigger permit requirements.
When to Build a Freestanding Garden Trellis
The conventional time to build outdoor pieces like garden trellises begins in early spring and runs throughout the summer. Post holes must be dug, which can be difficult in frozen ground.
Building a freestanding garden trellis requires you to dig deep fence post holes. Call 811 before digging for a free utilities location service to visit your yard and mark electric, gas, water, and other vital services buried in the yard.
What You'll Need
Equipment / Tools
- Posthole digger
- Bubble level
- Hand saw or electric miter saw
- Galvanized exterior grade nails
- Exterior grade screws
- 2 4x4s: 4 inch x 4 inch x 8-foot pressure-treated lumber
- 7 1x2s: 1 inch x 2 inch x 8-foot lumber
- 2 2x2s: 2 inch x 2 inch x 8-foot lumber
- 14 Lath: 5/16 inch x 1-1/2 inch x 8-foot wood lath
- 4 2x4 galvanized flat rail fence brackets
- 2 Bags of quick-set concrete
- 2 Post covers for 4x4s
- 2 Bags of all-purpose gravel
Each section of the trellis is anchored at both ends by fence posts. As with building a fence, begin by digging two holes with the post-hole digger. Situated eight feet apart, the holes should be about 9 inches wide by 2-1/2 feet deep.
Pour all-purpose gravel into the holes until you have reached about six inches of gravel. Tamp down the gravel with one of the 4x4 posts. Set the 4x4 post in one of the holes and pour the quick-set concrete into the hole, around the post.
Pour clean, cool water into the hole up to the ground level or per the instructions listed on the concrete bag. Use the bubble level to ensure the post is plumb. Prop up the 4x4 securely for four hours for the concrete to cure and fully set.
Repeat for the second post.
Attach 2x2s to the Posts
Cut each of the two 2x2s to 5 feet long.
Attach two of the 2x4 galvanized flat rail fence brackets to the inside of one post and two to the other post. Situate them so that the top brackets are about a foot below the top of the post and the bottom brackets are about a foot above ground level.
Attach the 2x2s to the insides of the 4x4 posts, so that they are resting inside of the brackets. Place each one so that it is about 6 inches lower than the height of the posts.
Screw through the holes in the brackets to secure the 2x2s.
Attach Horizontal Slats
Nail all but one of the lath strips horizontally to the 2x2s, spacing them out by about five inches. Begin with the top strip and bring it to level with the bubble level. Next, nail in the bottom strip.
Attach Vertical Slats
Attach the 1x2s vertically to the horizontal slats. To prevent wobble, have an assistant hold an anvil or another heavy object behind the nailing surface as you hand nail.
Alternatively, you may wish to use a cordless or compressed air nailer. In this case, back support would be beneficial but not necessary.
Space these vertical slats equally down the line (about 12 inches apart, on-center).
Add Finishing Touches
Two more elements give your garden trellis a polished look: a decorative lath strip and post covers.
First, nail the remaining lath strip to the very top of the vertical members. Locate this final lath strip so that its flat side is parallel to the ground.
Second, nail the post covers to the tops of the 4x4s. Not only do these covers round off the posts and give them a smoother look, but they also prevent water from pooling on top of the posts.