板藍根与大青叶为同一植物,俗名藍。前者是根部,后者是叶部。除根、叶均作藥用外,其叶尚能制染料。我国南部各省均有野生,家种者以江苏省的南通、海門、如皋、崇明一带为主产地。安徽滁县亦产少量,以南通县的川港、海門县天补區为最多。採制本植物为一年生草本,有栽培亦有野生。栽培品通常於农历2—3月下种,用散播;下种后一月左右,將其幼株拔插均勻,株距2寸,行距3寸;然后施肥,隔20日后再追肥一次,施肥愈足,其苗叶就会很快的成長。叶从根基部簇生而出。4—5月即可刈叶一次,8—9月可再刈一次,亦有刈3次者。叶 Banlangen and Daqingye are the same plants, commonly known as blue. The former is the root and the latter is the leaf. In addition to roots and leaves for medicinal purposes, its leaves can still make dyes. The provinces in the south of China are all wild and the main producers are Nantong, Haimen, Rugao and Chongming in Jiangsu Province. There is also a small amount of production in Jing County, Anhui Province, with Sichuan Province, Nantong County and Tianmen District of Haimen County being the most. The plant is harvested as an annual herb, cultivated and wild. Cultivated products are usually planted in the lunar calendar from February to March, with spread; around the next month or so, the young plant inserted and inserted, plant spacing 2 inches, spacing 3 inches; then fertilization, every 20 days after top dressing, fertilization even more The seedling leaves will grow quickly. Leaves clustered from the base of the root. From April to May, the leaves can be picked up once. From August to September, they can be picked up once more, and there are also three times. leaf