In relation to gardening frost means ice crystal which are formed at temperatures below 32⁰F, when water vapour condenses out of the air and settles on a cool surface, such as on the garden beds or garden plants. Frost is a frozen form of dew that damages plants by freezing the burst and die. A light frost can occur at 30-32⁰F, forming a touch of white on the ground which are short lived; as soon as the sun hits them they are gone and the most frost sensitive plants will survive. At lower temperature, a killing frost can occur and damages most of flowers and vegetables in the garden.