As Plants Migrate North, USDA Revisits Hardiness Zones

USDA Changes Plant Hardiness Zones

The USDA issued a new map of plant hardiness zones for 2012. Last updated in 1990, the map divides the United States, including Puerto Rico, into 13 separate zones-representing regions of minimum average winter temperatures. The map is divided into 10˚F zones.

Zone boundaries also shifted. Many… Continue reading