Plant in the garden at a depth of 5-6 inches deep and 2-6 feet apart after the spring's last frost. Add amendments to clay soils in the garden to aerate the soil and allow for good drainage. Place the tubers so the pointy side is facing upward. Add compost or soil conditioners and mix in with the native soil. Depending on the earth's warmth, it usually takes three to eight weeks for sprouts to appear. To speed up the process, start them in containers inside the house and then move them outside into the garden when foliage emerges, being careful not to shock it. Start watering more consistently when foliage emerges.
If growing in a planter container, use a well-draining potting soil with perlite to aerate the soil.
Cut the leaves back and dig up in the fall before temperatures drop below 40°F. If you are in a cooler zone (3-8), remove the tubers from the soil with an inch of stem attached. Knock off all the soil and lay them on newspaper in a dry place for a week. Do not wet or wash the tubers. Sprinkle them with powdered sulfur to protect against fungi while they're in dormancy. Lay on a single layer screen or in a mesh bag so air can circulate around them. Store the tubers at 50°F-60°F.