Mulch, mulch, mulch!
...erfect lawn. I know many happy kids who live in such yards. And as a kid myself, I preferred such spaces. I have no fond memories of grass. I do have strong memories of playing in wilder spaces–under trees, among boulders, in a rainy gutter, in the snow, at the beach. Lawn, for me, was always a suspicious place full of dangerous sprinkler heads and hidden dog poop. The one exception I will buy for lawn is as a good surface for babies and toddlers....