'Black Barlow' is a cultivar of the Barlow Series, which is noted for being the first Aquilegia vulgaris series with fully double, spurless flowers. Other Barlow varieties include Aquilegia ‘Blue Barlow’, Aquilegia ‘Nora Barlow’, Aquilegia ‘Rose Barlow’ and Aquilegia ‘Bordeaux Barlow’. They all are lovely additions in the shade garden! Zone 2.