"Glass gardens?" Peggy echoes, trying to imagine it in her head. "The plants aren't made of glass, right?" she asks, wondering if she sounds as stupid as she imagines she does to be asking that question. "From what I can recall, glass isn't a precious commodity, not if you know how to make it. I believe it's just a matter of heat and pressure, but I'm no expert." The boys might've known better, especially Dernier and Falsworth and their love of things going boom.