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
Answered on May 6, 2014
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