Hakonechloa macra 'Aureola'

 (Japan Forest Grass) Graceful, slow-growing golden, deciduous ground cover for dry shade. Zones 5-7

Hebe 'Colvos Creek' (Blue Hebe)

Steele blue vertical foliage to 2 ft. Best in sun to partial shade. Zone 7

Hebe pimeleoides 'Quick Silver'

(Silvery Hebe)
Silvery-gray foliage 12 to 18 inches. Purple-blue flowers in summer. Hardy to 10 degrees. Sun. Zone 7

Hebe 'Suffock Carpet'

(Carpet Hebe)
Evergreen foliage 6 to 8 inches. Purple-white flowers in late spring. Use as groundcover like heather. Hardy to 10 degrees. Sun. Zone 7

Haloragis erecta 'Wellington Bronze' (Toatoa)
Bronze, saw-edged foliage.  Spikes of interesting greenish-yellow flowers. A striking feature to the garden. 2 ft. Sun. Zone 7

Hedychium gardneranum 'Fiesta' (Kahili Hardy Ginger)
Creamy-yellow flowers with red stamens. Can grow to 8 feet. Light shade, moist, well drained soil. Native to India. Zone 7

Hedychium greenei (Hardy Ginger)
Tropical-looking foliage up to 5 ft. Orange-red flowers to 5 inches long. Moist soil, light shade. Zone 7

Hemerocalllis 'Odd Fellow' (Daylily)
Semi-evergreen foliage 6 to 12 inches. 3 to 4 inch reddish-apricot flowers. Sun. Zone 5

Heptacodium miconioides (Seven Son's Plant)
Fragrant White  flower panicles in late Summer to Fall, with fruit following. Exfoliating bark, small tree or shrub. From Western China. Sun. Zone 5

Heuchera Assorted Variety (Coral Bells)
Purple to green foliage with sprays of white flowers. 1 to 2 foot. Sun to partial shade. Zone 7

Hosta aureomaculata (Plantain Lily)
Limey and yellow-green foliage on 2 ft. plants.
Purple flowers in summer. Shade. Zone 3-9

Hosta 'Francee' (Francee Plaintain Lily)

White edges on forest green bold foliage. Lavender flowers. Nice for a shady area. 22 x 48 inches. Zone 3 to 9.

Hydrangea macrophylla 'Niger'

(Black Stemmed Hydrangea)
White tinged pink flowers with striking reddish-black stems on large deciduous shrubs. Shade to partial sun. Zone 7

Hypericum empetrifolium nanum (Creeping St John's Wort) Evergreen, and low-growing with starry golden-yellow flowers. Best in Sun. Zone 7

Hypericum x moserianum 'Tricolor' (Tricolor St John's Wort)
Yellow starry flowers, on red, green and white, low-growing foliage. Bushy to trailing habit. Best in Sun. Zone 7