Secret signals

The vineyards out back are not owned by one person. There are many individual parcels owned and tended by different local growers. After ten years, I pretty much know who owns which bunch of vines out there. Some of the parcels are marked off by little flags or rags, like this one.

A rag tied to the support wire at the end of a row of vines.

I don't know what they mean, really. They're not permanent; they appear and disappear or get moved around from time to time. I suspect they have something to do with marking the starting/stopping points for seasonal workers who aren't familiar with the vineyard layout.