10' rebar posts driven 3' into the ground, tight against the bed edging, tied together with 4' rebar rails and badger clips. For single-stem tomatoes there's one rail, across the top, and each plant, one per foot, winds up a line of string hung from it. The rails are all straight.
Isometric NTS
10' rebar post4' rebar railBadger clipString
End Section Through a post
Front Elevation Along the row
Detail 3 · Rail Clip Badger clip at a crossing
Bill of Materials 20'-0" row, 5 sections
#
Item
Qty
1
Rebar posts, 10' lengths (½" #4 typical)
6
2
Rebar top rails, 4' lengths
5
3
Badger clips, one at each end of each rail
10
—
Garden string, one line per plant, one plant per foot
20
—
Post driver or sledge
tool
Build Sequence
Mark posts every 4'-0" along the inside face of the bed edging.
Drive each 10' post 3'-0" deep, tight against the edging. The edging holds the row straight and the posts plumb, so the trellis stays lined up and looks kept.
Clip the top rails at 6'-6" on the bed side of the posts, each running post to post with no overhang. Where two rails meet at a post, each gets its own clip.
Plant one tomato per foot along the row. Tie one string per plant to the top rail, prune each to a single stem, and wind the stem up the string as it grows.