I use wire but you could probably get away with zip ties if you use the UV rated ones, and plenty of them
FWIW, EMT tubes are pretty strong. the trellis I have posted in the picture above has held 40lbs+ squash + vines, tomato plants. I have used 24" stakes driven into the ground with 10" exposed and slid in a square plate washer so that the EMT tube doesn’t sink into the ground.
ive seen someone use 2 8ft cattle panels set in a v. or a 16ft. panel bent in a u and secured with rebar, pounded in the ground to hold in place. both would work for tomatoes ,pole beans, kiwi, or grapes.
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what i was talking about above. seen them used alot for grapes. i may do 1 panel for my dewberry like this.
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