Red-violet cell suspension cultures of Chenopodium rubrum were found to accumulate the betacyanins amaranthin, celosianin and betanin and the betaxanthins vulgaxanthin I and vulgaxanthin II. Under a 16-h daylight regime the cells accumulated 0.3–0.4% betacyanins on a dry mass basis after 2–3 weeks of cultivation on the growth medium. Experiments to define a production medium for betacyanins failed with this habituated line. The accumulation could however be increased up to 1% or 100 mg betacyanins/1 by feeding tyrosine and by adaptation of the inoculum size to the nutrient concentration.