If you're building a fence, a retaining wall or a planter, set a course of protruding stones in the soil beneath it. That way, your mower can cut all the grass—no trimming by hand needed. The stones should protrude about 4 in. from the wall and stand at least an inch above the soil so grass doesn't creep over them.
Blue oat grass Refined and elegant, this grass has beautiful blue-gray, fine-textured leaf blades that grow in a mound. It is stunning throughout most of the season and combines well with most perennials. In fall, brownish spikelets reach for the sky. Size: to 4 feet tall, 1-2 feet wide Conditions: full sun and well-drained soil Zones: 4-9 Best for: its blue-gray color and neat appearance