What temperature is too cold for sunflowers?

Consequently, what temperature can sunflowers tolerate?

Sunflowers thrive in warmer weather and climates. They are known for their hardiness and the ability to survive extreme heat; however, the optimal temperatures for growing sunflowers is between 70 and 78 degrees Fahrenheit, with soil temperatures of at least 55 to 60 degrees when the seeds are sown.

Also, can sunflowers live through winter? Annual sunflowers don't tolerate cold and should be planted only after the soil has warmed to at least 55 degrees Fahrenheit. You can also start them indoors in pots about six weeks before the last frost.

Also, how do I protect my sunflowers from frost?

Materials such as cheesecloth, a fine pliable screen or polyspun garden fleece work best. Polyspun garden fleece comes in a sheet of loosely woven material. Gardeners commonly use it to protect plants from frost, but the loose weave works well to protect sunflowers as well.

When can sunflowers be planted outside?

When to Plant Sunflowers You can plant sunflowers outside at the same time you plant peppers, tomatoes, eggplants, zinnias, and other warm-season vegetables and flowers. For a longer sunflower bloom period, plant a row or grouping of sunflowers every two weeks for four to six weeks during the early summer.