The hard to spell Houttuynia, is a monotypic genus (containing only one species), which hails from eastern Asia, often growing in woods or damp places, including the margins of paddy fields. Heart-shaped, exceptionally scented foliage (not too everyone's taste), sometimes citrus or like coriander. It is used as a salad crop in China. Flowers are small, in a spike, but surrounded by bright white bracts. In damp or good soils it will spread quickly, so worth growing in a part of the garden where its easily contained, or in pots and troughs.