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Pycnostachys urticifolia is a herbaceous perennial, 1–2.5 m high. The leaves are densely covered with hairs; broad and almost triangular, margins of leaf with rounded teeth, becoming smaller near the top. The flowers, which are arranged in spikes at the tips of the branches, range from mauve to dark cobalt blue. This South African shrub is often known as ‘Blue Witches Hat’ in the USA.

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