In one sentence, describe what the following article is about:

You’ll want to choose a type of plant and growing methods according to how cold it gets where you live. In short, if you live in a climate that has consistent winter temperatures between 10 °F (−12 °C) and 20 °F (−7 °C), plan to plant artichokes annually. If you live in a relatively warmer climate, you may be able to grow a perennial artichoke variety.  If you live in the U.S., see the maps provided by the USDA’s Agricultural Research Service to determine what zone you live in. If you live in Zone 8 or higher—which corresponds with the temperatures cited above—go with an annual plant varietal. These USDA maps also contain information on the temperatures used to assess an area’s zone, which you can compare to temperatures in your area. There are several artichokes varieties, generally classified as either green or purple.  Among the green varietals, go with “Imperial Star” artichokes for an annual plant and “Green Globe” for a high-producing perennial.  Among purple artichoke options, “Violetta” may prove especially hardy, and “Opera” will mature especially quickly. Rich, fertile, moist soil is best for artichoke growth.  That said, artichokes are hardy plants capable of growing in most soil as long as they are fed and the soil can drain. Consider building raised beds to assist in drainage if you live in an area with heavy rainfall. Plan to prepare soil with at least 6 inches (15 cm) of compost tilled into the ground before planting.
Identify your growing zone. Choose a type of artichoke. Ensure adequate soil.