120 days. Perennial, Non-GMO, Heirloom Seeds. This heirloom Artichoke from Italy produces purple-headed fruits measuring from 3 to 6 inches across. These artichokes are a beautiful purple shade that will brighten up any garden. They are tender and juicy, and are said to be more tolerant to both heat and cold than most green strains are, making them a great option for gardeners in varying climates. Their color fades during cooking.