Cardoons are ornamental plants grown for their blanched stems, which are used, both cooked and raw, in salads. Plants may be raised from seed sown in a warm greenhouse or in a frame in April, two or three seeds in each 3-in. pot. Reduce seedlings to one per pot and harden off for planting out at the end of May. The plants should be 18 in. apart in rows 3 ft. apart. Situation should be open and the soil well dug and manured. Blanching starts in September, when plants are well grown, and is done as for celery, or by tying corrugated brown paper or clean straw around the stems. Usually about eight weeks are required to obtain well blanched stems.