Plants can reach 3 feet in height and width, and the flower, if allowed to bloom, can be 7 inches in diameter. Harvesting Globe Artichokes. Remove the main stem head first (this is called the king head), and then remove the secondary heads as they develop. The Jerusalem Artichoke is a sunflower and the tuber is the edible part. They can grow up to 3 feet long. The plants are large growing between 4 ½ and 6 ½ feet tall. Green Globe Artichoke typically take about a year to produce but once productive will provide plenty of reward for your effort, and can produce for 5 years or more. Globe artichokes (Cynara scolymus) are relatives of the thistle. Big flower buds that form at the tops of stalks may be cut for eating. The Globe Artichoke is a member of the Asteraceae family, is a thistle and the flower bud is eaten. Globe artichoke produces best in deep, fertile, well-drained soil, but will grow in a wide range of soils. The leaves are deeply lobed and grey green in color. As a perennial Green Globe Artichoke care is straightforward. In zone 7 and warmer, they are perennial. Imperial Star . Do not allow a plant to develop more than six heads in this second year. From the third year onwards, you can allow up … If not cut, buds open to spectacular purple, thistle-like flowers, great for arrangements. Grows best in fertile, well-drained soil in full sun. As well as providing food, globe artichokes are attractive plants in the garden. If you’re looking for a hardy artichoke that will grow well as an annual, Imperial Star artichokes are ideal for artichoke … Green Globe artichokes are the most common in the US, especially in California, but aren’t as hardy as other varieties in unideal growing conditions. Harvest your own tender artichokes! What are Globe Artichokes? They are native to the Mediterranean area. Artichoke is both a nutritious vegetable and a beautiful landscape plant. Improved Green Globe Artichoke Cynara scolymus 'Improved Green Globe' Sku #8891. Soil preparation.