<P> The Club currently has 18 tournament grass courts , eight American clay courts , two acrylic courts and five indoor courts . There are also 22 Aorangi Park grass courts , which serve as competitors ' practice courts before and during The Championships . The grass courts can be used from May until September . The grass has been cut to 8 mm since 1995 , and 100 % perennial ryegrass has been used for its strength since 2001 ( prior to that , it was 70 % perennial rye and 30 % creeping red fescue ) . The courts are renovated in September , using nine tons of grass seed annually . </P>
<P> The Club currently has 18 tournament grass courts , eight American clay courts , two acrylic courts and five indoor courts . There are also 22 Aorangi Park grass courts , which serve as competitors ' practice courts before and during The Championships . The grass courts can be used from May until September . The grass has been cut to 8 mm since 1995 , and 100 % perennial ryegrass has been used for its strength since 2001 ( prior to that , it was 70 % perennial rye and 30 % creeping red fescue ) . The courts are renovated in September , using nine tons of grass seed annually . </P>
how many tournament grass courts does wimbledon have
how many tournament grass courts does wimbledon have
18
18