I have a 16x8 trellis that I have poured concrete piers piers above grade with 1/2” rebar protruding 6 inches so to mount the cedar corner posts. Tied it together with primed and painted 2x6’s as I didn’t want treated lumber which at some point would have to be treated or painted. Cross braced with 2x2’s on the ends and one long side then ran 2x2’s across the top to support the vines and to further strengthen the structure.
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