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.

Achlys triphylla is a unique ground cover attractive to pollinators and hummingbirds. The dried three-part leaves smell like vanilla.

Actaea japonica 'Silver Dance' has wands of creamy-white bottle brush flowers and silver foliage maturing to green.

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

Actaea pachypoda 'Misty Blue' is a white baneberry with bluish foliage and white flowers followed by white fruit with a black dot.

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.

Adiantum pedatum, the northern Maidenhair fern, is one of the most beautiful of all ferns with distinctive palmate fronds.

Adiantum raddianum 'Fragrantissimum' is an evergreen maidenhair fern with arching black stems and light green aromatic fronds.

The evergreen Himalayan maidenhair fern, Adiantum venustum, forms delicate and elegant, slowly expanding mats.

Adiantum x mairisii is a delicate hybrid with black stems and lacy, bright green fronds. Sure to delight in the shade garden.

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.