Last May Growing Greener featured the challenge that Plan it Wild, a rewilding design and installation firm, posed to American homeowners: to replace 25 square feet of lawn with locally indigenous plants. Today we hear how nearly 10,000 people in 49 states committed to this 12-week online program, how backyard biodiversity flourished as a result, and how the challenge is expanding through neighborhoods to reach people who hadn't previously considered devoting their landscapes to reinforcing the regional ecosystem.