I asked my husband to build me a sturdy trellis and as usual, he outdid himself. We (well, I stained it) started with two pre-made panels that are 2 x 6 found in the garden center at Menard's. Add to that three green treated 4x4 posts (8 footers), two 2x4 scraps of green treated lumber (bottom of each panel) and 2x6 green treated cap and this beautiful trellis cost us less than $50 to build. Of course, it is absolutely square and level, cause that is the kind of guy he is. Each post is sunk into cement (which we had on hand, leftover from a fence install.