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Abelmoschus manihot 'Auntie Lilli's' is an edible salad bele tree with beautiful tri-coloured foliage and hibiscus-like flowers.
The upright stems of Abutilon 'Biltmore Ballgown' are festooned with dangling two-inch orange bells streaked with scarlet throughout summer.
Acaena inermis 'Purpurea' is an excellent ground cover for crawling over gravel paths or stones with gorgeous purple-blue-grey foliage.
Acaena saccaticupula 'Blue Haze' is an excellent ground cover with powder blue foliage.
Acanthus 'Whitewater' forms vigorous mounds of variegated foliage and pink stems holding white flowers.
Achillea 'Apricot Delight' has large, flat-topped flower clusters in various shades of pink on strong stems up to 24 inches with fragrant, fern-like foliage.
Achillea millefolium 'New Vintage Red' has large, flat-topped flower clusters of bright red with white centres.
Achillea millefolium 'New Vintage Rose' has large, flat-topped flower clusters of rose pink with white eyes on strong stems to 24 inches.
Achillea millefolium 'New Vintage Violet' has large, flat-topped flower clusters of bright lavender pink with white centres.
Achillea millefolium, the common yarrow, is an important nectar source and host plant for a diversity of insects.
Achillea ptarmica 'Peter Cottontail' is a unique yarrow with white, button-like flowers held in low, cloud-like mounds.
Aconitum 'Rubellum' is a distinctly different monkshood with pretty pink flower spikes.
Actaea (Cimicifuga) 'White Pearl' has dissected green foliage and exceptionally long spires of fragrant white flowers in late summer.
Adenophora 'Gaudi Violet' is a beautiful bellflower relative with elegant spikes of light violet bell-shaped flowers.
Agapanthus 'Galaxy Blue' has large umbels of royal blue, trumpet-shaped blossoms. Hardy to zone 6!
Agapanthus 'Galaxy White' has five inch wide umbels of white, trumpet-shaped blossoms on tall stems. Hardy to zone 6!
Agapanthus 'Little Galaxy' has large umbels of indigo blue, trumpet-shaped blossoms with a blue stripe on each petal. Hardy to zone 6!
Agapanthus 'Poppin' Purple' is a compact, fast-growing lily-of-the-Nile with violet purple flowers.
Agapanthus 'Silver Moon' has variegated leaves light lavender-blue flowers in rounded clusters.
Agapanthus 'Summer Love Blue' has fragrant violet-blue flowers on strong green stems and green, strap-like foliage.
Agapanthus 'Twister' is a striking bicolour lily-of-the-nile with rich blue and white flowers.
Among the best of the blue Agastache, 'Black Adder' has blue flowers and deep purple blue bracts for a bicolour effect.
Agastache 'Blue Bayou' is a long-blooming hummingbird mint with blue tubular flowers and aromatic foliage.
Hot sunny spots will never be the same with long-blooming Agastache 'Blue Boa'. Butterflies and bees will love you!
'Crazy Fortune' is a sport of Agastache 'Blue Fortune' with lavender blue flowers and variegated foliage.
Agastache 'Danish Delight' is an anise hyssop with vibrant hot pink to reddish-purple blooms and fragrant green foliage.
Agastache 'Mango Tango' is a compact, long-blooming hummingbird mint with dusky rose and peachy orange flowers.
Agastache 'Morello' is a dramatic hummingbird mint with huge, dense infloresences of deep burgundy rose flowers.
Agastache 'Pink Pearl' is a stunning hummingbird mint with dense spikes of mid pink buds opening to glowing light pink flowers.
Agastache Meant to Bee 'Queen Nectarine' has soft peach flowers with mauve calyxes on tall three foot stems.