A map relied upon ... has moved up a half-zone, don't go out and pull up all of your stuff in your garden and buy new plants," he said. More: As climate change alters Michigan forests, some ...

“When you’re in the city, the asphalt ... Area nursery managers and plant growers take the zone classifications for West Michigan in stride. The map is based on average minimum temperatures ...

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 ...