Dactylorhiza purpurella, the northern marsh orchid, produces beautiful, short spikes densely packed with magenta flowers.

Dactylorhiza purpurella x incarnata ssp. coccinea is a hybrid marsh orchid with magenta flowers with white centres.

Dactylorhiza sphagnicola x foliosa will produce spikes up to 20 inches tall of pink flowers with darker magenta markings.

Dactylorhiza x foliorella is a famous marsh orchid with spectacular spikes of glowing magenta orchid flowers.

Dahlia imperialis is the giant "tree dahlia" that reaches 10-20 feet tall with late late lavender blooms 3-4 inches wide.

Dahlia imperialis 'Alba' is the white form of the giant "tree dahlia" that reaches 10-20 feet tall with single white flowers.

'Life Style' is an unusually stunning, fully double dahlia with golden yellow petals on top of a double row of lavender-pink.

'Chianti' is a decorative-type dahlia with ivory and yellow flowers with a hint of pink atop gorgeous burgundy foliage.

Dahlia City Lights Golden Yellow has creamy golden yellow flowers on compact plants with rich burgundy foliage.

Dahlia City Lights Lavender Pink has rich pink flowers on compact plants with rich burgundy foliage.

Dahlia City Lights Purple has gorgeous velvety, deep magenta and purple flowers on compact plants with rich burgundy foliage.

Dahlia City Lights Red has luscious red flowers in tight pompoms on compact plants with rich burgundy foliage.

Dahlia 'Dahlegria White' is a stunning single dahlia with glowing tones of pink and lavender surrounding the white petals all atop burgundy foliage.

Dahlia Dalaya Pink and Lemon offers shades of deep pink to light pink with radiating yellow highlights.

Dahlia 'Melody Allegro' is a stunning multi-tone cultivar with alternating hues of orange, pink, salmon, and lilac.

Dahlia 'Fashion Monger' is a stunning single dahlia with bright red petals, tipped with white. The bright yellow center is adorned with rings of tiny white petals.

Dahlia 'Lake Ontario' is a stunning dahlia with fully double, golden yellow flowers edged in a rosy dark pink.

Dahlia 'Tirza' is a stunning dahlia with a creamy yellow background highlighted with deep pinkish red atop burgundy foliage.

Darlingtonia californica is an amazing and rare carnivorous plant known as the California pitcher plant.

Davidia involucrata is a must-have collector's item for woody plant enthusiasts with a floral display like no other tree.

Deinanthe bifida is a rare hydrangea relative with beautiful foliage and cool, white flowers.

Deinanthe caerulea is a rare hydrangea relative with beautiful foliage and cool, purple-blue flowers.