A hardiness zone is a geographic area with a similar average minimum temperature. The map is based on the average annual extreme minimum temperature, so people in those areas know which plants can ...

Another Illinois winter comes closer to a close, depending on which region of the state you live in. Cold and snowy days may ...

The Department of Agriculture maintains a Plant Hardiness Zone map, which most seed packets include in their instructions. The highest-numbered zones have the mildest winters, while lower numbers ...