Soil Quality

• Most grasses grow well even in soils with low fertility levels, as long as the site drains well. Too much water causes the roots to weaken and eventually leads to the decline of the grasses. Working compost into the bed isn't necessary, but can help improve drainage in poor soils. The exact soil needs vary depending on the variety of the grass, but generally a well-drained bed that is neither overly sandy or clay filled provides the best planting area.
  
  

Sunlight

• Light needs also vary by variety, but ornamental grasses generally thrive in areas that receive at least six hours of full sunlight. Beds with all-day sun provide the best location, but most grasses can tolerate some light shade in the afternoon. Referring to the plant tag indicates how much light the grass variety needs. Ornamental grasses that tolerate shade are available if you don't have a suitably sunny place for the plants.
  
  

Fertilization

• Too much fertilization is just as damaging as too little, especially for ornamental grasses that usually need low levels of soil fertility. Apply 1/4 cup of a slow-release 10-10-10 analysis fertilizer per plant when the grass begins growing in spring provides enough nutrients for the entire growing season. Soil testing once a year helps determine the exact fertility needs in your grass beds.
  
  

Water

• Grasses usually require regular irrigation in only the first year after planting. Once established the plants rarely require irrigation, except during dry periods. Providing 1 inch of water per week the first year keeps the root zone of the bed moist so the grasses develop a healthy root system. After establishment in the second year, watering only when the soil begins to dry out provides the necessary moisture.
  
  

Pruning

• Ornamental grasses provide interest to the landscape even in winter. The mounds of dried foliage and seed heads add texture to an otherwise barren winter landscape. The seeds may also attract overwintering birds to the yard. Trimming occurs in spring just before new growth begins. Grasses located near driveways and in other areas prone to fire danger can be cut back in fall for safety reasons.