Tensioning high tunnel wire for trellis -how?
I have two high tunnels I will be putting trellis wire in to hang tomato roller hooks off of. I have the wire (size recommended by Johnny's) and I know how I will fasten it to the high tunnel structure, but how do you tension the wire? I found a thing called a Gripple, but it's kind of expensive. Is this the only option? Also, do you release the tension from the wires in the off season?