Plant frames (Caldecott OX14)

Found in the shed. I recall that these three objects were bought as plant frames years ago but I can't
remember why or how to use them. If anyone has a better idea than me, you will be welcome to take them,
otherwise they are for the dump. Black plastic covered metal.
Each 48cm high and 25 wide. Possibly bought as some sort of frame for
a grow bag.

       
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