Humidity grids are just the thing for growing finicky plants—and drying your boots quickly! The secret to growing many plants, like orchids and African violets, is a humid environment. Here's an easy, economical way to humidify the surrounding air: place these grids in the waterproof trays of our SunLite® Gardens and arrange plants on top. Add the Rubber Grids to our English Boot Trays or our Steel Boot Tray to help your boots dry faster. Rubber Grids measure 20-3/4" L x 13-7/8" W x 1/2" H each Set of 2 grids 20-3/4" L x 13-7/8" W x 1/2" H each Gardener's Supply Exclusive