Combine Annuals and Perennials
Use Variegated Varieties
Hostas are a topnotch groundcover for shady areas. Plant them on a tough-to-mow hillside to create a lovely, carefree garden bed. If you have a steep slope that water runs down so quickly the soil can't absorb moisture, try breaking up the hill with rocks or other barriers. It will slow the flow of water.
Stop Mowing Slopes
Grow a Variety of the Same Plant