Five materials, one afternoon, roughly $30 — that’s all a garden arch trellis takes using the cattle panel method. Not centering your T-posts under the panel is the most common reason arches come out uneven, and skimping on zip ties invites wobble under a heavy vine load. The two-post method works for both in-ground rows and raised beds, and the trenching alternative gives you a cleaner look with buried panel bases when you want it. Ready-made versions exist if you’d rather not build, but this DIY version costs a fraction of the price and holds up just as well. Bending the panel is a two-person job, so grab a helper, drive those posts square, and your climbing crops will have a sturdy home by the end of the day.