Delaware is in hardiness zone 7. Northern Delaware is zone 7a (0 to 5 °F/-17.8 to -15 °C) and the coastal area of Sussex County is zone 7b (5 to 10 °F/-15 to -12.2 °C). Plants like camellia or pampas ...

The USDA designation of plant hardiness zones is based on the lowest average ... A good swath of the state sits in the 7a to 7b range, meaning that the lowest average temperature in winter is ...