| Hardenbergia violacea |
Purple Coral Pea |
 |
| Hebe (many) |
Veronica |
 |
| Hebe |
Veronica |
 |
| Hebe speciosa |
Veronica |
|
| Hebenstretia dentata |
Hebenstretia |
|
| Hedychium |
Ginger Lily |
|
| Hedychium coccineum |
Ginger Lily |
 |
| Hedychium densiflorum |
Ginger Lily |
 |
| Hedychium gardnerianum |
Kahili Ginger |
|
| Helenium autumnalis |
Sneezeweed |
|
| Helianthemum hybrids |
Rock Rose |
|
| Helianthus annuus |
Sunflower |
|
| Helichrysum monstrosum |
Strawflower |
|
| Heliconia bihae |
Red Lobster Claw |
|
| Heliconia revoluta |
Heliconia |
|
| Heliophila longifolia |
False Blue Flax |
|
| Heliotropium |
Cherry Pie Plant, Heliotrope |
|
| Helleborus niger |
Christmas Rose |
|
| Helleborus orientalis |
Hellebore, Lenten Rose |
|
| Helleborus viridis |
Green Hellebore |
|
| Hemerocallis |
Day Lily |
|
| Hepatica nobilis |
Liverleaf |
|
| Herbertia pulchella |
Herbert's Iris |
|
| Hermannia saccifera |
Cumin Bush |
|
| Hesperis matronalis |
Dame's Violet, Sweet Rocket |
|
| Heteropappus meyendorfii |
Blue Chrysanthemum |
|
| Heuchera (many) |
Coral Bells |
|
| Heuchera |
Coral Bells |
|
| Hibbertia scandens |
Snake Vine |
|
| Hibiscus (many) |
Hibiscus |
|
| Hibiscus coccineus |
Texas Star Hibiscus |
|
| Hibiscus rosa-sinensis |
Hibiscus, Chinese Hibiscus |
|
| Hibiscus syriacus |
Hibiscus, (US) Rose of Sharon |
|
| Hippeastrum (Amaryllis) |
Amaryllis Hybrid |
|
| Hoheria (many) |
New Zealand Lacebark |
|
| Hoheria lyallii |
Mountain Lacebark |
|
| Homeria collina |
Cape Tulip |
|
| Hosta |
Plantain Lily, Funkia |
|
| Humulus lupulus |
Hop |
|
| Hutchinsia (Pritzelago) alpina |
Alpine Cress |
|
| Hyacinthoides (Scilla) non-scripta |
Bluebell |
|
| Hylomecon japonica |
Japanese Poppy |
|
| Hymenosporum flavum |
Australian Native Frangipani |
|
| Hypericum perforatum |
Perforate St John's Wort |
|
| Hyssopus officinalis |
Hyssop |
|
