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Artichokes can be either directly sown outdoors or can be started indoors. Artichokes require rich soil and regular watering. To start, sow 3-4 artichoke seeds per 8-10 square inch area and about ¼ inches deep. Keep the sown area dark and warm until seeds germinate in 20 to 25 days. In case you are starting seeds indoors, transplant the seeds outdoors two weeks after the last winter frost.