Abelia 'Kaleidoscope' has long-lasting, fragrant flowers and variegated foliage in yellow, green, orange and red.

The upright stems of Abutilon 'Biltmore Ballgown' are festooned with dangling two-inch orange bells streaked with scarlet throughout summer.

Abutilon 'Nabob' produces masses of large, rich red, pendulous lanterns from spring through fall.

Acanthus 'Whitewater' forms vigorous mounds of variegated foliage and pink stems holding white flowers.

Achillea 'Coronation Gold' is an award-winning yarrow with masses of flat-topped, golden yellow flowers.

Achillea 'Apricot Delight' has large, flat-topped flower clusters in various shades of pink atop fern-like foliage.

Achillea millefolium 'New Vintage Rose' has large, flat-topped flower clusters of rose pink with white eyes.

Achillea millefolium 'New Vintage White' has large, flat-topped flower clusters of pure white eyes flowers.

Achillea 'Terracotta' is a distinctive yarrow offering shades of yellow, orange, and terra cotta.

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.

Actaea (Cimicifuga) 'White Pearl' has dissected green foliage and exceptionally long spires of fragrant white flowers in late summer.

Actaea (syn. Cimicifuga) 'Black Negligee' has lacy black foliage and wands 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 'Silver Moon' has variegated leaves light lavender-blue flowers in rounded clusters.

Agapanthus 'Twister' is a striking bicolour lily-of-the-nile with rich blue and white flowers.

Agapanthus 'Valencia' offers sky blue flowers with darker veins and reverses on dark stems.

Agapanthus Fireworks is a striking lily-of-the-Nile with bicolour flowers of violet blue and white.

Among the best of the blue Agastache, 'Black Adder' has blue flowers and deep purple blue bracts for a bicolour effect.

Agastache 'Guava Lava' is a hummingbird mint with coral-orange flowers and mauve-pink calyxes.

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 Meant to Bee 'Queen Nectarine' has soft peach flowers with mauve calyxes on tall three foot stems.

Agastache 'Royal Raspberry' is a long-blooming hummingbird mint with fragrant purple tubular flowers and aromatic foliage.

Agastache 'Tango' is a dwarf cultivar with big flower power in firey orange for containers or the front of the border.

Agastache cana Sonoran Sunset forms short, full, stocky plants to 16 inches tall and wide boasting masses of fragrant raspberry purple flowers atop fragrant foliage.

Agastache Coronado Red is a long-blooming hummingbird mint with brilliant, fiery, orange-red, tubular flowers from late spring until fall.

Agastache foeniculum is a long-blooming perennial great for summer colour and bees and butterflies.