| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Heliotropium supinum | prostrate heliotrope, spreading heliotrope | Annual | forb |
|
Hemerocallis 'Stella d'Oro' | daylily | Perennial | forb |
|
Heracleum mantegazzianum | giant hogweed, cartwheel-flower | Perennial | forb |
| Heteropterys glabra | Redwing | Perennial | vine | |
| Hibiscus syriacus 'Diana' | Rose of SHaron | Perennial | shrub | |
|
Hibiscus trionum | Venice mallow, bladder-ketmia, flower-of-an-hour | Annual | forb |
|
Hieracium aurantiacum | orange hawkweed, devil's-paintbrush, red daisy, flameweed, devil's-weed, grim-the-collier | Perennial | forb |
|
Hosta 'Halcyon' | hosta, plantain lily | Perennial | forb |
|
Hosta sieboldiana 'Frances Williams' | hosta, plantain lily | Perennial | forb |
|
Houttuynia cordata | chameleon | Perennial | forb |
|
Hyacinthoides hispanica | Spanish Bluebell, Spanish Jacinth, Bell-Flowered Squill | Perennial | forb |
|
Hydrangea macrophylla 'Bailmer' ENDLESS SUMMER THE ORIGINAL | hydrangea, bigleaf hydrangea, mophead hydrangea, hortensia, French hydrangea, Endless Summer hydrangea | Perennial | shrub |
|
Hyparrhenia hirta | Tambookie grass, Thatching grass, Coolatai grass, South African bluestem | Perennial | grass |
|
Hypericum androsaemum | sweet-amber, tutsan | Perennial | shrub |
|
Hypericum calycinum | Aaron's beard, Creeping St. John's-wort, Rose-of-Sharon | Perennial | shrub |
|
Hypericum grandifolium | (none listed) | Perennial | shrub |
| Hypericum x inodorum 'Kolmapuki' PUMPKIN | St. John's wort, tutsan, pumpkin hypericum, First Editions(R) pumpkin hypericum, Magical(R) pumpkin hypericum | Perennial | shrub | |
|
Ilex aquifolium | English holly, European holly, Oregon holly, common holly, holly | Perennial | tree |
| Ilex cornuta 'Burfordii' | Burford Holly | Perennial | tree | |
| Ilex cornuta 'Needlepoint' | Needlepoint Holly | Perennial | shrub | |
| Impatiens balfourii | Kashmir balsam | |||
| Impatiens glandulifera | Himalayan balsam, ornamental jewelweed, Indian balsam, policeman's-helmet | |||
| Imperata cylindrica (L.) Raeusch. | Cogongrass, speargrass | Perennial | grass | |
| Ipomoea batatas | sweet potato | Annual | vine | |
|
Ipomoea indica | blue morningglory, blue dawn-flower, blue morning-glory, common morning-glory, morning-glory, ocean-blue morning-glory, perennial morning-glory, purple morning-glory, purple-flower bellvine, purple-flower morning-glory, tall morning-glory, blue dawnflower, oceanblue morning-glory, dunny creeper | Perennial | vine |