What temperature is too cold for annuals?
Consequently, what temp is too cold for flowers?
Winter is hard on your flowers. Tender annual flowers like impatiens can't survive a frost or temperatures below 55 degrees. Half-hardy annual flowers can survive brief, light frosts and temperatures of 35 degrees to 45 degrees. To be safe, protect all your plants when the temperatures drop.
Similarly, it is asked, what is the lowest temperature petunias can tolerate?
(16 to 18 C.). However, petunias usually tolerate temperatures as low as 39 F. (4 C.) with no problem, but they are definitely not plants that will survive the winter in most climates.
They prefer daytime temperatures around 70 degrees Fahrenheit and 60 degrees overnight. Temperature dips below 50 degrees might damage begonias and prolonged cold snaps can weaken or kill them. Bring potted plants indoors to a cool porch or basement.