We are nearing the end of putting up a 14' x 40' polytunnel and are designing the inside. Due to levelling the poles across a slight lateral slope we will be ending up with a design of beds some 12" above path level - might well have gone for this anyway. Thing is we want a layout where a lot of the bed edges are curves.
Can anyone suggest a good material to use to retain the beds - strong enough to retain soil, not too thick as taking up valuable space, aesthetic and of course flexible to make curves.
Thanks