Dorchester, Wisconsin. Dorchester is a village in Clark and Marathon counties in the U.S. state of Wisconsin, along the 45th parallel. It is part of the Wausau, Wisconsin Metropolitan Statistical Area. The population was 876 at the 2010 census. Of this, 871 were in Clark County, and only 5 were in Marathon County.
Petunias have a base temperature of about 39 degrees F and are considered cold tolerant; however, freezing temperatures can kill petunias because the plants' cells need the sun's energy for photosynthesis.nce petunias have endured frost or freeze injury, there is not much you can do to save the plant. At times, frost-injured plant parts can be cut back, and plants may outgrow the damage. Petunias can survive the light frost of southern climates, as petunias will come back in the spring following a hard freeze.
USDA Plant Hardiness Zone Map. The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.SDA Plant Hardiness Zone Map. The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.