19 mm polypipe hoops covered by bird netting.   The hoops and netting is in addition to the 13 mm polypipe mini stakes.  The hoops and netting are removed before the plants get too large while the mini stakes are usually left in until the crop has been harvested.

Larger 25 mm high density agricultural polypipe covered with bird netting.   The plants are French Green silverbeet.  This structure is designed to stay in place for the life of the plants.