Plant perennials with your annuals in containers. At the end of the season, plant in your garden OR winter over in your container, to come back next year.
The garden shape is usually backed by a structure, such as a house or fence and is usually planted to be viewed from 2 to 3 sides.
A rain garden is a garden of native perennials planted in a small depression. The longer roots absorb the water and decrease the runoff going into our sewers, streams, and rivers.