Petunia Growing Zone. 03012021 Store petunias indoors during the winter to grow them again the next year. 05012021 Petunias are tender perennials in USDA plant hardiness zones 9 through 11 but they are usually grown as annuals so most people in the country are able to plant them.
In hottest parts of the country get petunias planted while days are still cool so theyre fully established before heat arrives. Hardiness zone of a plant is a geographically defined area in which a particular type of plant is capable of growing according to the climatic conditions. 22022021 Plant petunias whenever theyre displayed for sale at local garden centers starting in spring.
If your plants arent producing look at where theyre located to see if lack of sunlight could have something to do with it.
09052017 Petunias dont like cooler temps. Although some species of petunia are tropical perennials todays hybrids are usually grown as annuals so hardiness zones arent a factor in growing them. They have delicate paper-thin blooms that can become easily frostbitten and damaged. In intermediate- and low-desert areas such as Tucson and Phoenix and in eastern zone 10 petunias fail in humidity or during extended periods of high heat temperatures in the 90s or both.