| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Gunnera tinctoria | Chilean gunnera, Chilean rhubarb | Perennial | forb |
|
Gypsophila paniculata | Baby's-breath | Perennial | forb |
|
Halimodendron halodendron | common salttree, Russian salt tree | Perennial | shrub |
|
Hedera helix | English Ivy | Perennial | vine |
| Hedera helix 'Thorndale' | English Ivy | Perennial | vine | |
|
Hedera hibernica | Irish ivy, Atlantic ivy | Perennial | vine |
|
Helianthus tuberosus | Jerusalem artichoke, earth apple, sunchoke | Perennial | forb |
| Helichrysum petiolare | licorice-plant, silver-bush everlasting-flower | Perennial | forb | |
|
Heliotropium amplexicaule | blue heliotrope, clasping heliotrope | Perennial | forb |
|
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 |