Our area can reach 100 degrees in July. Will Stock be done at those temperatures, or will it reflower in the fall, if deadheaded?
Will Stock Reflower in the Fall?
Mostly, stock is considered an annual, so after it flowers in the spring, that's it. Some people report that it acts like a biennial, or even a perennial. I suspect partly this is because of climate variation, and partly because of cultivar varieties. This article may give you some more information: https://www.gardeningknowhow.com/ornamental/flowers/stock/growing-stock-flowers.htm