Well, I arrived at the farm last night to find several row covers off their supports and even a couple of the supports out of the ground. That is strike two for my binder clips. I am not sure why some rows remained secure and others didn’t unless the ones that came undone just had too much material and not enough grip of the support rods. So, I re-covered the hoops and reclipped less of the fabric to the support rods. I’ll see how this works. If it doesn’t, I may have to double up the clips, try a larger size, or go back to some sort of clamp.