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Position full sun or partial shade Soil light, moderately fertile, humus rich, moist but well drained soil Rate of growth average Flowering period June and July Flower colour indigo blue Other features attractive to butterflies and bees wrinkled, grey green leaves Hardiness fully hardy A delightful, colourful plant with spikes of indigo blue flowers in early to midsummer. This reliable perennial is ideal for the middle of a moist, well drained herbaceous border. It flourishes in sun or dappled shade where the bright flowers help to liven up any plant scheme. Garden care To prolong flowering remove the flower spikes as soon they start to fade. Apply a generous 5 7cm 2 3in mulch of well rotted garden compost or manure around the base of the plant in spring.
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