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Below are some photos of metal trellises that we built years ago when we lived in Wisconsin.
This was our first garden metalwork project, a hanging trellis made of welded 1/4″ steel. It is 18″ wide and 32″ high. The design is a real circuit called a Darlington amplifier. The plant is Mina lobata, which will get yellow and red flowers that hummingbirds love.
Here are the second and third trellises we made, 73″ high and 30″ wide. The first circuit is part of a Geiger counter, the second circuit is a crystal calibrator, and the vines are morning glory.