There can't be many better value perennials than this wonderful wallflower. Although not as scented as many of the biennials, this gorgeous mauve flowered perennial wallflower is rarely out of flower throughout the summer. The glaucus leaves perfectly complement the bee-friendly flowers. It can become woody after several years but is very easy to propagate from cuttings of non-flowering shoots - if you can find one! A must-have plant.

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