Answer: Dames Rocket (Hesperis matronalis) is a biennial, meaning it grows for a year, lives through a winter, blooms in the spring, sets seed and then dies. The resulting seedlings will grow for a year and repeat the pattern. In this way you would have a patch of these in the garden. If you wish to grow a patch of these, be sure to allow the flowers time to fade on the plants and allow the seeds time to develop fully and fall to the ground before you cut back the plants.
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