Aquilegia caerulea ‘Heavenly Blue’ (syn. ‘Sky Blue’, ‘Blue Dream’) – This is a large-flowered Columbine with sky blue petals and spurs, a white corolla and contrasting golden stamens that blooms from May through to July. It thrives in part to full sun exposures and bears light green fern-like foliage. Shows well in containers. Grows 24-30″ high by 12″ wide. Hardy to zone 3.
Aquilegia x hybrida ‘Songbird Cardinal’ – This variety bears beautiful red and white upward-facing bicolor blooms from spring through to early summer. This member of the Songbird Series is an F1 hybrid strain which can be easily grown from seed. The compound bluish-green foliage is quite fern-like. Naturalizes well. Grows 20-28″ high by 12-16″ wide. Hardy to zone 3.
Aquilegia vulgaris var. stellata ‘Green Apples’ – The buds and young blooms of ‘Green Apples’ are distinctly pale green and mature to rounded, fully double creamy-white flowers. It blooms from May through to July and will attract pollinators to your garden. This flower form is commonly known as Granny’s Bonnet. Grows 18-24″ high by 15-18″ wide. Hardy to zone 3.
Aquilegia vulgaris var. stellata ‘Ruby Port’ – Another of the Granny’s Bonnet types with rounded double blooms of a deep maroon red borne from May to July. It is an heirloom plant (dating back hundreds of years) with compound foliage that resembles Meadow Rue (Thalictrum). Short-lived but naturalizes by self-seeding. Grows 24-30″ high by 15″ wide. Zone 3.
Aquilegia x hybrida ‘McKana Giants’ – A seed strain which is noted for its large (up to 3″ long) blooms of yellow, pink, blue, purple or scarlet. It is an All-American Selections winner (1955) that flowers from May through to July. ‘McKana Giants’ also make excellent cut flowers for the vase. Pale green fern-like foliage. Grows 24-30″ high by 12-18″ wide. Hardy to zone 3.