Trumpet lily is native to cool temperate environments, preferring temperatures ranging from 41 to 77 °F (5 to 25 ℃). Adjustment may be required in winter or summer to keep within this preferred temperature range.
Trumpet lily is highly cold-tolerant and does not require additional frost protection measures during winter. However, before the first freeze in autumn, it is recommended to water the plant generously to ensure the soil remains moist and enters a frozen state. This helps prevent drought and water scarcity for the plant during winter and early spring.