Step 1: Getting your tools and materials
Looking for a garden feature that's low cost and easy to assemble? Then this archway trellis is perfect for you. We made it from inexpensive steel “rebar” that you can find at any home center. Once the trellis is covered with climbing plants, the steel disappears and you have a dramatic entryway into your garden.
Our design, about 7 ft. high and 6 ft. wide, is made of two 20-ft. lengths of rebar that you bend into arches. You then simply join the arches with rebar circles, lashing them together with wraps of copper wire. No welding needed—and there's no maintenance. The materials for our trellis cost less than $25. For comparison, a welded metal or high-end vinyl trellis costs several hundred dollars.
In this story, we'll show you how to create smooth bends in rebar and how to assemble the trellis. You'll need a few simple tools, including a conduit bender ($30) for tight curves and a hacksaw for cutting the bar to length. In the “fun-to-buy-tools”department, you may want to pick up an angle grinder ($50) and a metal-cutting blade for quicker rebar cuts. And don't forget to buy a pair of heavy leather gloves.
Allow a full day to build your first trellis. Once you’'e mastered the process, you should be able to build a second one in less than half a day. Rebar itself is relatively inexpensive: A 20-ft. length of 1/2-in. costs about $7 and 3/8-in. about $4. The main problem is getting your 20-ft. lengths home. Rebar is floppy, not stiff. One trick is to buy a 16-ft.-long 2x4, attach it to your roof rack and then lash the rebar to it. (Be sure to attach a red flag to each end of it.) Otherwise, delivery costs vary from $50 to more than $100.
Once it's built, you'll place the trellis
16 to 18 in. in the ground.
Figure A: Arched trellis
Use these dimensions to build the trellis.
Call 411 to have underground utilities marked in your yard. You'll be driving stakes and setting the rebar arches about 18 in. into the ground.
Step 2: Create smooth bends with stakes
To create that swooping arch from the 1/2-in. rebar, make a simple bending jig on the ground. Cut the 10-ft. length of 1/2-in. rebar into ten 10-in.-long stakes (Photo 1). Drive one rebar stake into the ground and tie a 3-ft. string to it. When you pull the string taut, you create a compass and can mark a smooth arc with chalk (Photo 2). Space the other nine stakes evenly in a semicircle around the arc, driving them at least 5 in. deep (Photo 3).
The 3-ft. radius makes an arch that will span 6 ft. You can make it larger or slightly smaller if you want. But we found that bending 1/2-in. rebar into a 2-ft. radius is difficult.
Rebar may kink when you bend it, so we inserted a cushion (a 9-ft. length of plastic garage door stop molding; available at home centers) between the rebar and the stakes to soften the bend (Photo 4). You can use some other firm but flexible item, like vinyl siding or a strip of flexible hardboard to cushion the rebar as well.
Photo 4 shows how to bend the arches. Hold the rebar at the ends while you bend it to keep the arch smooth. Overbend it slightly; the ends will spring back a bit when you release them. Don't worry about that; the arches will form the correct radius when you set them in the ground.
Step 3: Create circles with a conduit bender
We linked the arches together with circles bent from the 3/8-in. rebar. Cut the rebar into 4-ft. lengths and bend them with a 1/2-in. conduit bender (available in the electrical department of any home center or hardware store).
Work on a solid surface and simply fit one end of the rebar into the lip of the bender. Then form the curve by pulling the handle and pressing down on the tool with your foot (Photo 5). Shift the bender and continue the bend until you have a complete circle. The circle will have a 12-in. diameter. Cut off the extra rebar. Don't worry if the circles aren’t perfect. Minor imperfections will be minimized when you wire them to the arches and hidden when your greenery grows.
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Step 4: Assemble the arches
Now find the ideal spot in your yard for the trellis and lay out the footprint (Photo 6). To keep it sturdy and stable, you have to sink each arch end about 18 in. into the ground. Measure up each leg and wrap tape at the 18-in. mark as a depth guide (Photo 7).With a helper, press the ends of the two arches into the ground. Drive a stake partway down to get started, or use a 3/4-in. steel pipe as a holder (see “Solution for Hard Soil”).
Then add the 3/8-in. rebar circles. Position the first circle about 2 ft. up from the bottom of your arch. Any lower and you may be inviting little feet to use the trellis as a makeshift ladder. Use cable ties to temporarily secure the circles in place, with the cut ends against one arch (Photo 8).
Later you'll cover these sharp edges with the wire wrap. Space the remaining circles evenly around the arch. They'll be about 6 in. apart. The cable ties allow you to easily reposition the circles for the best appearance before you wire them into place.
To bind the circles, simply wrap the copper wire around the arch/circle joint. There is no special technique here. About 2 ft. of 18-gauge solid copper wire will do. Just keep the binding tight and extend it about 2 in. along the joint for good stiffness. And tap the wire ends down flat to the rebar with a hammer.
Once you attach the circles to the arches, your trellis is ready to shepherd creeping vines upward, adding height and dimension to your outdoor space.
Drive 3/4-in. pipe into hard soil, then set the arch
end in the pipe.
Solution for Hard Soil
If you have hard soil, you won't be able to push the arches directly into the ground. Instead, you'll have to plant the rebar arches in a pipe.
Drive an 18-in. length of 3/4-in. galvanized pipe most of the way into the ground as shown. Pull out the pipe and poke the dirt from the inside of the pipe until it's open. Then push the 3/4-in. pipe back into the hole and drive it down until it's flush with the ground. Now, simply insert the arch ends in the pipe.
Don't Worry About Imperfections
Chances are your rebar arches will look a bit irregular at first. Don't panic. Once you push them into the ground, they'll look more balanced. However, they may never be perfect. Resist the temptation to fix them. A little pressure here, a little push there and the next thing you know, you've got a lopsided mess on your hands.
It's better to soldier on and attach the rebar circles—the trellis will come together nicely. Bumps that were driving me wild eventually vanished beneath the greenery.