Over the years, the number of varieties of turfgrass species that are commercially available has, for the most part, nearly doubled. Below are the National Turfgrass Evaluation Program's (NTEP) numbers of various species from different years, esimated using the number of entries in NTEP tests. This is not the total number of cultivars commercially available because NTEP's tests do not comprise all cultivars that are on the market at any one time. Kevin Morris, NTEP executive director, estimates the actual number to be 25 to 30 percent higher.

PERENNIAL RYEGRASS

1980	estimate 15 (no NTEP test yet)
1986	40
1990	53
1994	97
2002	100

FINELEAF FESCUE

1980	estimate 15 (no NTEP test yet)
1983	20
1987	30
1993	74
1998	56

KENTUCKY BLUEGRASS

1980	40
1985	50
1990	55
1995	93
2002	102

CREEPING BENTGRASS

1985	estimate 7-8 (no NTEP test yet)
1989	12
1993	17
1998	20
2002	25

TALL FESCUE

1980	estimate 10 (no NTEP test yet)
1983	20
1987	25
1992	60
1996	70
2000	86

Source: Kevin Morris, executive director, National Turfgrass Evaluation Program