Answer: Sweet William may grow as a perennial or sometimes as a biennial. Biennials grow for a season, live over the winter, then bloom the second season. Once they set seed, they die, but if allowed to set seed and reseed there will be an ongoing patch of these plants. These plants usually bloom in the spring only. Sometimes deadheading can enhance the blooms from buds already forming on the same flowering stems, but it probably won't extend it significantly.
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