Did you a segment about constructing a "greenhouse top" for a VegTrug?
by
Turk Edwards
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You can make one out of PVC pipes! https://www.youtube.com/watch?time_continue=1&v=YMAcs-uPTC4
https://www.youtube.com/watch?v=YMAcs-uPTC4 shows how to build a "greenhouse top" for a raised bed garden.
https://www.youtube.com/watch?v=NZmPDPx6GCQ details how to build a "hoop house" for a raised bed garden. (We used this with great results.)