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Finely hairy, evergreen perennial, usually grown as an annual or short-lived perennial for its foliage. Semi-succulent, 4-angled stems bear broadly to narrowly ovate, toothed, sometimes frilly-margined, multi-coloured leaves, to 15cm long, often heart-shaped at the bases and hairy beneath. Terminal, whorled racemes, to 15cm long, of tiny, blue or white flowers, 1.5cm long, are borne at any time of year. Dead-head to maintain foliage colour.
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