Diascia integerrima 'Coral Canyon' is a twinspur with rose-pink flowers that bloom all summer long until frost.

The Pacific or western bleeding heart (Dicentra formosa) is a lovely shade with fern-like foliage and pendulous pink flowers.

Firecracker flower (Dichelostemma ida-maia) has cool red, green and white tubular flowers held in clusters.

Dichelostemma 'Pink Diamond' is a firecracker flower with lavender-pink, light pink and white flowers.

Dichroa febrifuga 'UBC Form' is a rare hydrangea relative with clusters of pink or blue flowers followed by long-lasting metallic, purplish berries.

Dicliptera suberecta is commonly known as the firecracker or hummingbird plant with nectar-filled, deep orange flowers.

Diervilla Honeybee is a beautiful, super hardy shrub with brilliant gold leaves and tubular yellow flowers popular with bees and butterflies.

Diervilla Firefly Nightglow is a super hardy shrub with burgundy leaves and clusters of yellow flowers popular with bees and butterflies.

Digiplexis 'Firecracker' is a foxglove hybrid with orange-yellow flowers with rosy overtones and gray-green foliage.

Digiplexis 'Rising Phoenix' is a sterile foxglove with tubular flowers of rosy-pink and light apricot hues on tall spires.

Digitalis purpurea 'Dalmatian Peach' is a common foxglove with peach-tone flowers and orange speckled throats.

Dolichos lablab 'Ruby Moon' is a vine with lavender, pea-like flowers followed by large, purple pods held on purple stems amongst purple-infused foliage.

Echeveria 'Giant Blue' has huge succulent rosettes of grey-blue edged with pink.

Echibeckia are crosses between coneflowers and black-eyed Susans. 'Summerina Brown' has unique orange and burgundy flowers with dark centres that bloom for months.

Echibeckia are crosses between coneflowers and black-eyed susans. 'Summerina Orange' has striking orange, yellow and rust-coloured flowers for months.

Echibeckia 'Summerina Yellow' has striking gold petals with a rusty-orange inner halo surrounding a red-brown cone.

Echinacea pallida 'Hula Dancer' has slender, reflexed, white or pink ray florets around reddish-brown cones.

Echinacea paradoxa has deep yellow, daisy-like flowers and coppery-chocolate-brown central cones.

Echinacea purpurea 'Pink Double Delight' is a shorter purple coneflower with fully-double pink flowers.

Echinacea 'Delicious Candy' has bright magenta-pink coneflowers with horizontally held petals around large, red cones on strong, well-branched stems.

Echinacea purpurea 'Double Decker' / 'Doppleganger' sports a second tier of petals which erupts from the tip of the cone.

Echinacea purpurea 'Fatal Attraction' is a purple coneflower with large deep purple-pink flowers with upright petals on red stalks.

Echinacea purpurea 'Green Envy' is a peculiar coneflower with rounded, green petals and green cones.