Sweet william is native to climates with seasonal temperature variations, typically between 32 to 95 °F (0 to 35 ℃). It prefers cooler conditions and should be gradually adjusted to temperature increases in the summer to prevent shock.
Sweet william has strong cold resistance, so special frost protection measures are usually not necessary during winter. However, if the winter temperatures are expected to drop below {Limit_growth_temperature}, it is still important to provide cold protection. This can be achieved by covering the plant with materials such as soil or straw. Before the first freeze in autumn, it is recommended to water the plant abundantly, ensuring the soil remains moist and enters a frozen state. This helps prevent drought and water scarcity for the plant during winter and early spring.