Thanks for all the suggestions, particularly from B2N2. Should we paint both sides of each blade of grass?
you need something that eats gophers and ground squirrels
N707ZS,
Yes, we already have those - North American badgers. The drawback is that in their enthusiasm for rodent snacks, they dig wheel-sized holes, which could ruin your whole day. We have to inspect the runway every morning and fill in badger holes. We have a trapping program which keeps the rodent population down.
RBF,
I suspect you know our field. I thought about moving the windsock, but that would require a post extension of several metres to keep it above the hangar roof line and in a southerly wind, the sock would even closer to a passing wingtip.