105-112 days to maturity. Dianthus barbatus. Dianthus Double Mixture Seeds. Non-GMO, Annual, or Biennial. Ornamental. Double Mix Sweet William seeds promise elegant 3-5 inch blooms of crimsons, scarlets, and pinks to invigorate your home or garden. Sweet William Double Mix seeds are easy to grow, tolerant, and mature into brilliant, fragrant blooms irresistible to hummingbirds, butterflies and bees. Double Mix Sweet William seeds grow sweet, herbal flowers commonly used in the kitchen to accent jams, fish, or Mediterranean dishes. Sweet William Double Mix seeds can grow as perennials in optimal climates, but thrive as hardy biennials in most gardens. About 25,000 seeds per ounce.