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. Petunias are damaged extensively at 32 F.Click to see full answer. Similarly, how cold is too cold for hanging baskets?If you have plants in hanging baskets or other containers, bring them inside. The following methods can be used to limit frost injury. However, protection for temperatures below 25 degrees Fahrenheit may not be possible.Also Know, how do you protect petunias from frost? Mulch can prevent petunia roots from becoming too cold during a brief frost and may even provide sufficient protection for the petunia foliage. Use dry leaves or a straw mulch for frost protection. Mound the mulch over the plants after irrigation, and completely cover the crowns, where stems and roots merge. Thereof, how cold can petunias survive? about 39 degrees F Should I cover my petunias? Protecting Petunias Because the weather frequently warms into Indian summer after a harsher frost, you may be able to keep your petunias blooming until late fall simply by covering them whenever the temperature threatens to drop below 29 F.

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