(Da qing; Qiug dai) Contains indican and isatin B, both of which can be converted to indigo. Considered antibacterial, antiviral, and anti-inflammatory. Leaves and roots are effective against flu, encephalitis, measles, hepatitis, and mumps.

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Chinese Woad (Isatis tinctoria)

Da Qing. Qiug Dai. Used in Chinese medicine as an antiseptic gargle and as an anti-inflammatory to irritated liver and spleen. The plant is considered anti-bacterial and ant-viral. Leaves and roots have been used for flu, measles, hepatitis, and mumps. Both varieties have been used historically as a source of blue dye prior to the introduction of Indigo. Easy to grow perennial with leathery blue-green leaves sending up stems with delicate yellow flowers. Considered a noxious weed in CA, OR and WA. Hardy to zone 3.