If the soil drains poorly, this should be corrected before planting to prevent rots and disease. A garden sketch or more detailed plan is recommended only because differing heights, colors, and textures can be enhanced with some thoughtful placement. This is not critical to your success in growing perennials. If one finds the plant arrangement is unsatisfactory it is quite simple to dig and move the offender during its dormancy. Perennial flowers offer a lifetime of discovery and pleasure.
Old gardeners remain young with each year's anticipation and surprises.
And new gardeners begin a satisfying adventure growing these beautiful flowers.