A keyhole garden is the ultimate raised-bed planter. It is often built in the shape of a circle measuring about 6 feet in diameter that stands waist-high and is notched like a pie with a slice cut away. A hole in the center holds a composting basket that moistens and nourishes the soil.
Credit: Bill Smith Creative landscape architect Deb Tolman tends more than 10 keyhole gardens on StarHaven Ranch in Bosque County, where she lives in a 10-by-10-foot converted oat bin. Most of her garden designs incorporate Central Texas’ bountiful limestone and include a frame to support a shade cloth during the hottest months.