Beginner Gardening: Borders for walkway, 1 by poolrunning

poolrunning wrote:
Pictured:

The 20x20' area between an existing straight concrete walkway and driveway. The bed in front of the house holds a few struggling hollies at present, with a peony at the dtiveway end. There's enough sun for an adjoining peony to curve that bed around to run along the seldom-used driveway. The "dumped" bluestone flags are not laid out yet. The white rocks are filling a hole and trench left by a stump and root that were removed-- thinking a dwarf Spirea and bulbs to start.