A rock garden always seemed to mean pretty little stones arranged neatly in a pretty little dish in which tiny plants grew. Or maybe rocks, neat little rocks, lining the border of a garden. At our house it has a bigger meaning. When Dean says he is going to do some rock gardening, he means getting in the bobcat, digging huge rocks out of the forest and dumping them in just the right place for the wall or the edge of the path, or in this case, the edge of an actual garden.
These will form the edge and support of his garden.
Then he brings dirt down from the forest to fill in the area.
Later (more pictures to follow of course) his garden will grow.
Just in case you were wondering, no, that isn't a bear in the background. That is Oso sniffing the ground where a bear might have been.