Sweet William, or Dianthus barbatus, are the ultimate cottage garden plant. A riot of pinks, whites, purples and reds with charming, old-fashioned blooms. In recent years, I have been a little ...

Sweet William (Dianthus barbatus) is an herbaceous perennial or biennial that is often planted as an annual flower. It is a very slow-growing plant that will eventually reach a height of about 2 feet.