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

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

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

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

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

Alstroemeria 'Spring Valley' is a cold-hardy Peruvian lily with yellow petals with dark orange highlights.

Alstroemeria 'Summer Break' is a cold hardy Peruvian lily with pink petals, white throats and burgundy markings on extra tall stems.

Alstroemeria 'Summer Pepper' is a Peruvian lily with red petals, yellow throats and dark markings on tall stems.

Alstroemeria 'Summer Saint' is a cold-hardy Peruvian lily with pink petals and creamy-yellow throats on tall stems.

Alstroemeria 'Summer Sky' is a cold-hardy Peruvian lily with white petals and yellow throats on tall stems.

Alstroemeria Inca 'Gold Coast' is a Peruvian lily with tropical looking blooms of lemon-yellow with speckled centres.

Alstroemeria Inticancha 'Bryce' is a dwarf Peruvian lily that has yellow, orange and red flowers that bloom from summer to fall.

Alstroemeria Inticancha 'Romance' is a dwarf Peruvian lily with pink and white flowers that bloom from summer to fall.

Alstroemeria Inticancha 'Sunstar' is a dwarf Peruvian lily with fuchsia-pink petals, yellow throats, and red speckles.

Amaranthus caudatus 'Coral Fountain' is an ornamental and edible tassel flower with drooping peachy-coral inflorescence.

Amaranthus cruentus 'Velvet Curtains' is a beautiful purple amaranth with dark crimson finely feathered plumes and red foliage.

Amsonia hubrichtii 'Butterscotch' is a blue star with powder-blue flowers and willow-like foliage with bright gold fall colour.

Anemone Puff 'Pink' is a compact Japanese anemone with amazing rosy-pink pompon flowers.

Anemone Satin Doll 'Glow' is a long-blooming, dwarf Japanese anemone with large, mauve-pink flowers.

Antennaria plantaginifolia is a cold hardy, ground covering pussytoes with silver-green leaves and fuzzy, white and pink flowers.

Anthericum liliago known as St. Bernard's lily, produces lily-like, star-shaped white flowers with yellow anthers.

Aquilegia canadensis 'Little Lanterns' is short in stature but free-flowering with red and yellow flowers popular with hummingbirds.

Aquilegia coerulea 'Rocky Mountain Blue' produces large, showy mid blue and white flowers on stems.

Aquilegia Kirigami 'Rose and Pink' is a columbine with single dark rose and light pink flowers.

Aquilegia Earlybird 'Purple Blue' is a columbine with single purple-blue flowers.

Aquilegia Earlybird 'Red Yellow' is a columbine with bi-coloured single flowers of yellow and red.

Aquilegia Earlybird 'White' is a columbine with single white flowers, yellow stamens and long spurs.

Artemisia 'Silver Lining' is a mounding white sagebrush with beautiful, broadly dissected, silver-gray foliage.

Aruncus 'Fairy Hair' is a goat's beard that produces sprays of creamy-white flowers above Astilbe-like,  highly dissected foliage.

Asarum canadense is the Canadian wild ginger with bell-shaped brownish-purple flowers and heart-shaped leaves.