Grass trilogy is based on the design principle of using at least three forms of grass:

Type 1 grass is walkable, playable manicured turf grass used near buildings. Type 1 grass is maintained with trim mowers, irrigation, garden chemicals and is bordered by landscape beds. Type 1 may contain single trees as specimens or interior landscape beds or garden amenities, such as pools, fountains, pavilions, decks and the like.

Type 2 grass is cut after grass goes to seed about twice seasonally. This grass is used within swales, meadows and under and around tree groves. In some areas this grass extends to the property boundary, especially along street frontage and next to neighboring buildings.

Type 3 grass is cut once a season with a small tractor. Type 3 is allowed within habitat preservation areas and along property
line buffers.

Each grass type is separated with a designed boarder and the perimeter of the property contains a four to eight-foot maintenance strip. A good formula for mixing these three types of site grass is 30-40-30 percent respectively.

Designers have always worked with grass with great effect since the days of Brown, Repton, Downing and Olmsted all of whom brought the English garden style to the United States.

Mesa, Arizona has adopted a grass for cash program that pays homeowners to tear up 500 sq. ft. of grass lawn and replace it with native desert plantings.

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Greening Grass Ordinances

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High-performance Grass Sustainability Metrics

1. Design is the first sustainable practice effecting use, placement, location, versatility in use, and the amount of maintenance and cost.
   
2. High-performance grass means the proper selection of species for proper growing condition of sun, soil moisture soil nutrition and for variation in the height, texture, color and form of grass ground covers used.
   
3. Grass areas shall be appropriately sized for intended use and to eliminate the ?EUR??,,????'?????<
4. Design with grass varieties that are drought tolerant to reduce the amount of irrigation required and use grassed areas to absorb storm water.
   
5. Select species that minimize the use of inorganic fertilizers, pesticides and weed control chemicals. Design grass areas to prevent the run off of these compounds and to absorb storm water run off.
   
6. Select species that grow slow and go to seed at a lower elevation.
   
7. Minimize lawn grass maintenance and develop grass varieties of exceptional quality that reduce maintenance costs.
   
8. Use a grass management plan based on the grass trilogy: manicured grass, long cut grass, and meadow grass in the ratio of 30-40-30.
   Type 1: adjacent to buildings and in heavy use areas manicured turf grass generally bordered by landscape beds and will be cut with trim mowers.
   Type 2: long grass that is cut twice seasonally and generally contains groves of trees and cut with zero turn estate mowers.
   Type 3: grass cut once a year that will generally contain free-standing trees and shrubs masses and will be cut with tractors.
   
9. Reduce the use of gasoline engine lawn mowers by over 50 percent.
   
10. Plant lawn grass to increase biodiversity.

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