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Luxurious, deep, violet blue flower spikes held over ultra green foliage. The flower spikes are long, wide and extremely showy. Great for summer colour. Compared to 'Blue Fortune', 'Blue Boa' has deeper violet blue flowers and wider flower spikes. Attracts hummingbirds and butterflies. The licorice-scented foliage is edible and good in salads. Excellent planted en masse in the perennial border or in the herb garden. Drought tolerant once established. Blooms from summer until frost.