More companies create tools for rooftop gardening

By DAVID RUNK Associated Press Writer

TRENTON, Mich. (AP) - More companies are developing technology and techniques for rooftop gardening as interest in local and homegrown food grows.

Rooftop gardens are an option for city dwellers who don't have yards. They can also be a good choice for manufacturers who have large, unused flat roofs but little land to spare.

The gardens provide environmental benefits similar to traditional green roofs, in which plants are used to reduce storm water runoff, filter pollutants and cut heating and cooling costs.

The Detroit-area manufacturer Trenton Forging is developing an energy-efficient way to use what would otherwise be wasted heat from the forge to warm a greenhouse on its roof year-round. Company president David Moxlow says fruit and vegetables grown on the roof have helped improve workers' diets.