What mother hasn't wished she could find a way to wrap her child in batting and protect her from the outside world forever? For Los Angeles interior designer Kimberly Biehl Schmidt, that protective impulse has been a real-life mission for the last seven years, since the day her then-1-year-old daughter, Isabella, touched a piece of bread—just touched it—and wound up in the doctor's office with one of her eyes swollen shut.

Tests turned up hundreds of allergies, 20 of them life-threatening. So she threw herself into research and discovered that the modern world is basically one big hazmat zone, especially for children with serious allergies (a percentage that has increased in recent years).

Go inside a truly green house.