Green Globe Improved Artichoke Seeds Heirloom Vegetable. First year artichokes are small & few in number but can still be suitable for harvest. Higher quality artichokes develop in the second and third years - therein lies the gardener's greatest challenge. Artichokes will not survive winter in most areas of Canada. We suggest digging up and overwintering dormant roots in a cool indoors area if you do want to try for a second year harvest.  “Green Globe” has deep green buds with a slight purple tinge. The artichoke flowers are best harvested when 5-9 cm (2.5-4″) in diameter. The fleshy base of the flower scales and the firm centre are the edible portions. Plants can reach 1.5 m (4.5’) in height in one year.