Unheated greenhouses may be used all year in areas where the temperatures never dip below the freezing point, as Green House Secrets mentions. In other areas, they can be used to extend the growing season of plants like vegetables, small fruits, annuals and perennials.
About the Author
Hepzibah Flurge has been writing professionally since 2008. She is a horticulturist and her work appears on various websites and assorted gardening blogs. She holds a Bachelor of Science in horticulture.