Achillea millefolium, the common yarrow, is an important nectar source and host plant for a diversity of insects.

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 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.

Two tones of dark and light blue make the flowers of Amsonia 'Blue Ice' the best in the genus.

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

Amsonia 'Storm Cloud' displays star-like periwinkle blue flowers above silver veined foliage on dramatic near-black stems.

Anemonella thalictroides 'Rosea' known as rue anemone, is a delicate spring ephemeral with pale pink flowers.

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

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

Aquilegia canadensis has wonderful nodding bright red flowers with prominent nectar-filled spurs and yellow centres.

Ariseama triphyllum is one of two native Jack-in-the-pulpit species in North America. It has green and maroon striped spathes.

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

Asclepias incarnata 'Cinderella' has dense clusters of small rose pink and white vanilla-scented flowers that attract butterflies.

Asclepias perennis is a butterfly milkweed with white and pink flowers.

Asclepias tuberosa 'Deep Red' is a North American butterfly milkweed with nectar-rich, dark orange flowers.

Asclepias tuberosa 'Hello Yellow' is an Eastern North American Butterfly milkweed with nectar-rich yellow flowers that feeds Monarch butterflies.

Asclepias tuberosa is a hot orange butterfly milkweed native to the Eastern North America where it feeds monarch butterflies.

Asclepias verticillata is a rare eastern North American native known as the whorled milkweed.

Asclepias viridis is the green milkweed with large clusters of green petals and purple throats.

Aster novae-angliae 'Grape Crush' is a New England aster with purple flowers with orange eyes.

Baptisia 'Lunar Eclipse' is an exciting cultivar with shrub sized plants and lupine-like flowers that age from cream to lavender-blue.

Carex pensylvanica is a fine-textured sedge for shadier spots, including dry shade, as an underplanting or lawn alternative.

Chrysogonum virginiana var. australe or goldenstar is a an evergreen ground cover with single yellow flowers all summer long.