CARDOON - Cynara cardunculus. Cardoon is a tender perennial, mulch heavily in colder regions or grow as an annual. Sow seed in early spring when soil temperature has warmed to at least 50°. Plant seed about 1/8" deep in well prepared soil. Germination usually requires 14 to 30 days. Plant in full sun. Water regularly and thoroughly. Approximately 30 seeds per gram or 850 per ounce.