These just look like the walking creeping undead to me. This is what we have to do to keep frost off the cold-sensitive plants here in SW Florida.
Here's a shot of the frost. Unfortunately, it has been so cold for so long, it probably didn't work - and we just planted this whole lot with edibles : ( Maybe the ones who like the cold will be OK.
See more ABC pictures by clicking the button to the right. Peace. B : )