Dicentra 'Burning Hearts' produces lusty deep red bleeding hearts edged in white atop ferny blue foliage.

Dicentra 'Love Hearts' has ivory white bleeding hearts with pink tips and a slight fragrance. Bluish foliage.

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.

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

Dierama igneum has showers of bell-shaped flowers deeply dissected into lobes in shades of magenta-red to tomato-red.

Dierama medium is an angel's fishing rod, also called lilac hairbell, with lovely bell-shaped purple to lilac flowers.

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

Digitalis obscura is a unique foxglove with red and orange flowers.

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

Digitalis thapsi 'Spanish Peaks' is a reliably perennial selection noted for its lovely raspberry-rose flowers.

Digitalis x mertonensis is the Merton foxglove with rosy-pink flowers and darker speckled throats and lives longer than common foxglove.

Dyckia 'Pale Ryder' has dramatic silver-white rosettes of succulent foliage edged with dramatic teeth. A fantastic pot specimen and winter houseplant.

Dyckia 'Red' has dramatic red rosettes of succulent foliage with silver undersides. A fantastic pot specimen and good winter houseplant.

Echeveria 'Flame' has thick grey-green leaves with pink to reddish edges.

'Crested' is an unusual cristate form of Echeveria agavoides with young apple green to yellow leaves with red tips.

Echeveria agavoides 'Ebony' has dramatic pointed apple green leaves with red and black tips.

Echeveria agavoides 'Ebony Wide Leaf' has broad apple green leaves with red, burgundy and black tips.

Echeveria agavoides 'Honey Pink' has young apple green leaves tipped with pinkish red.

'Peach'/'8' has beautiful broad, bluish green leaves that can develop peach and apricot tones with stress.

'Lipstick' is a dramatic form of Echeveria agavoides with apple green leaves with tips in bright lipstick red.

'Romeo' is a special form of Echeveria agavoides in which the normally apple green leaves are flushed and speckled with red.