Use these DIY instructions to make your own planting box for veggies
To cover newly planted seedlings with bird netting or a season-extending floating row cover, add hoops to the PVC pipe supports in your bed. To form a hoop: Bend one of the 10-foot pieces of 3/8-gauge rebar so that it arcs into a half-circle, then slip each end of this hoop into a PVC pipe support.
Repeat with remaining rebar to form and secure two more hoops. Then drape the bird netting or row cover over all three hoops.