Sweet peas (Lathyrus odoratus) are prized for their old-fashioned fragrance, delicate form, and a palette ranging from the palest pinks and violets to richly saturated reds, blues, and purples. Centuries of classical plant breeding have given us diverse floral forms, including bicolor, streaked, and picotee patterns; larger, lovelier multiflora and ruffled types; and, more recently, varieties that extend the bloom season with low-light and cool tolerance, such as the Elegance series, or heat and drought tolerance, such as Mammoth Choice Mix.