Hotbeds and Cold Frames

This publication discusses the differences between hotbed and cold frame structures for growing out-of-season plants including the recommended dimensions, operating procedures, and the fall and winter uses for both. A table is provided listing the suggested soil mixture for planting. Illustrations are given showing a typical cold frame, the cross section of a manure-heated pit hotbed, an electric hotbed with thermostat control, flue- heated beds, and the proper way to cover hotbeds and cold frames on extremely cold nights.