Definition: an artificial mound or bank built of earth and stones and planted with rock plants; a garden in which rockeries are the chief feature.
In this location you should find one of these said rock gardens. It is quite a large rock garden filled with various sizes and shapes of grey speckly rocks. Some say its purpose is to divert water flow, prevent erosion, and eliminate the need to plant grass. I say it's a devious place to hide a geocache!
I swore I would never hide a cache in rocks like this, but in a moment of weakness (and maybe mischeif) I hid a cache in the rocks. I called it igneous. Everyone hated it. I heard stories of cachers who walked up to the lovely garden and shook their heads saying "Nope! Nope! Nope!" or they start turning them over with the same response. "Nope...Nope...Nope...." So I took another oath to never do it again... and then I happened upon this magnificent rock garden and the weakness (deviousness, mischiviousness, humor) got me again. Oops. You are searching for a red bison tube that thinks it is a rock.