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But San Francisco biotech firm Tinctorium believes it has the answer: genetically engineering bacteria to mirror the way the Japanese indigo plant, Polygonum Tinctorium, makes and holds its colour.

Polygonum coccineum was the most prominent plant in the pond edge association.

An herbaceous plant of the genus Polygonum, section Bistorta; snakeweed; adderwort.

Polygonum.—A large family, varying much in character, often weedy, but of easy culture in ordinary soil.

In varieties of Poa, Polygonum, Allium, Gagea, etc., this phenomenon is constant in plants growing in damp situations.