Ornamental Grasses – Their Place In A Dry Climate Garden

• Whether very low growing or billowing to 2 meters in height, they provide a sense of movement in the garden and a very definite vertical accent.
  
  
• By virtue of their feathery growth habit, a very clear texture is created in the garden composition, allowing ornamental grasses to function amongst broad-leaved plants as an emphasis element, or as a transitional element between fine textured plants, and courser textured ones. When placed amongst fine textured ornamentals which are not grass like, a subtle variation on the theme of delicate texture is created. In this way, two principles of good design are addressed – namely unity on the one hand (feathery texture) and variety (grasses and broadleaved plants) on the other.
  
  
• In dry climate regions where water is at a premium a few grasses can be dispersed in a bed of ornamental pebbles or wood chippings. With the addition of some stepping stones, such a configuration could replace a thirsty lawn and be aesthetically pleasing at the same time.
  
  
• They associate excellently with narrow leaved plants of outstanding sculptural value such as Yucca, Nolina, Dracaena, Phormium and Dietes. Therefore grasses of varying heights and shades can be massed to form the basis of a composition, playing a supporting role to a few special plants which function as emphasis elements. As the mass of grasses share a common leaf shape with the sculptural plants, the criteria of both unity and variety are again satisfied.
  
  

• The Pampas grass, Cortaderia selloana is suitable for large scale situations only. The real beauty is in the massive plumes that billow spectacularly from the foliage. The leaves of Pampas grass are serrated along their entire length, making the plant potentially dangerous. It should never be planted close to paths and entrances. A safe alternative to the Pampas grass could be the giant sedge, Cyperus papyrus
  
  
• Fountain Grass, Pennisetum setaceum grows to almost 2 meters, and also sports beautiful flower plumes. The main drawback is its tendency to disperse seed profusely, thereby becoming a noxious weed in certain circumstances. The purple leaved variety of the same species, ‘Rubrum’, does not seed itself and its foliage color is magnificent providing the plant is not over-used. It needs to be cut to the ground a couple of time a year and sometimes degenerates after a few years, but can nevertheless make a stunning contribution to the design. P.s.’Rubrum’ covers about a meter in width, and therefore tends to smother neighboring flowers in an herbaceous border.
  
  
• Of similar size and habit is the Silver grass, Miscanthus sinensis. A number of varieties of the species have been developed, the most famous being the elegant M.s. ‘Gracilimus’.
  
  
• There are a large number of low growing grass-like plants to choose from which are suitable in a herbaceous flower border, and indeed “hold" the bed for the period of time when annuals have to be replaced, or perennials cut down and rejuvenated. Examples are Liriope, Ophiopogon, the ever dependable Festuca, and various species of the sedge, Carex. Care should be taken though in choosing species that do not spread vegetatively and become a weedy pest. Some 5 years ago I added the cute and delicate Bulbous Oat Grass, Arrhenatherum elatius bulbosum to a flower bed, only for it to totally take over the border. It looked very nice, but my customer had enjoyed her flower color and so we had to spray the grasses to eliminate them before replanting the border. You have been warned!