《天工开物·上篇·彰施》
茶蓝，也就是菘蓝，扦插就能成活。但是蓼蓝、马蓝、吴蓝等品种就都要用种子繁殖。
茶蓝即菘蓝，插根活；蓼蓝、马蓝、吴蓝等皆撒子生。
Tea blue, also known as China Blue, can survive cuttings. However, varieties such as Indigo, Madder and Indigo must be propagated by seeds.