We put them round small trees/shrubs, this stops the rabbits getting at them (so we a re told, but we don't seem to have rabbits here so maybe uncessry) it marks out where the shrub is so it doesn't accidentally get mowed over, if you put a 2 or three over the young tree it acts as windbreak
Great for putting over the taps that someone decided would be good to locate in the middle of paddocks, either 1 foot above or 3 inches below the level of the soil
