Fountaingrass  A beautiful, mounding plant, fountaingrass offers a beautiful shape -- as well as soft, feathery plumes that dance in the breeze.  Name: Pennisetum alopecuroides  Growing Conditions: Full sun and well-drained soil  Size: To 5 feet tall  Zones: 5-9  Plant This Grass Because: It offers a graceful, arching shape and beautiful plumes.