He just stopped mowing his lawn, and after a few years, he had some grad students come, and they did sort of a bio-blitz of his backyard, and they found 375 plant species, including two endangered species.
Ele parou de cortar a grama e, depois de alguns anos, alguns universitários fizeram uma espécie de "bioblitz" no quintal dele e encontraram 375 espécies de plantas, incluindo duas espécies ameaçadas.