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Scientific Name Common Name(s) Plant Category Image
Grevillea spp. Grevillea 'Robyn Gordon', Silky oak, silver oak Poisonous Plants
Gymnocladus dioicus Kentucky coffee tree, Kentucky coffeetree Poisonous Plants, Trees
Gypsophila paniculata Baby's breath Perennials, Poisonous Plants
Hedera canariensis Algerian ivy, Canary Island ivy, Canary ivy, Coney Island ivy, Madeira ivy Groundcover, Poisonous Plants, Vines
Hedera helix English ivy, common ivy Groundcover, Poisonous Plants, Vines
Helenium autumnale Common sneezeweed, Sneezeweed Native Plants, Perennials, Poisonous Plants, Wildflowers
Helenium flexuosum Purple-headed sneezeweed Native Plants, Poisonous Plants, Wildflowers
Helenium spp. Sneezeweed Native Plants, Poisonous Plants, Wildflowers
Heliotropium amplexicaule Creeping heliotrope Perennials, Poisonous Plants
Heliotropium arborescens Heliotrope Annuals, Poisonous Plants
Heliotropium spp. Heliotrope Poisonous Plants
Helleborus argutifolius Corsican Hellebore Poisonous Plants
Helleborus foetidus Bearsfoot hellebore, stinking hellebore Poisonous Plants
Helleborus niger Christmas rose Poisonous Plants
Helleborus orientalis Christmas rose, Helleborus, Lenten rose Groundcover, Perennials, Poisonous Plants
Hippeastrum spp. Dutch Amaryllis, South African Amaryllis Perennial Bulbs, Poisonous Plants, Spring Bulbs
Humulus lupulus, H. japonicus Hops Poisonous Plants
Hyacinthus orientalis Dutch Hyacinths, Hyacinth Perennial Bulbs, Poisonous Plants, Spring Bulbs
Hydrangea anomala subsp. Petiolaris Climbing hydrangea Poisonous Plants, Vines
Hydrangea arborescens Smooth hydrangea, Wild hydrangea Native Plants, Poisonous Plants, Shrubs
Hydrangea arborescens 'NCHA1' PP20,765 Invincibelle™ Spirit Mountain Hydrangea , Mountain hydrangea, Sevenbark, Smooth hydrangea, Wild hydrangea Native Plants, Poisonous Plants, Shrubs
Hydrangea arborescens 'NCHA2' PPAF Invincibelle™ Spirit II Mountain Hydrangea, Mountain hydrangea Native Plants, Poisonous Plants, Shrubs
Hydrangea arborescens 'NCHA3' PPAF Invincibelle™ Ruby Mountain Hydrangea Native Plants, Poisonous Plants, Shrubs
Hydrangea macrophylla Bigleaf hydrangea Poisonous Plants, Shrubs
Hydrangea paniculata Panicle hydrangea, Peegee hydrangea Poisonous Plants, Shrubs, Trees
Hydrangea quercifolia Oakleaf hydrangea Native Plants, Poisonous Plants, Shrubs
Hydrangea serrata Blood-on-the-snow, Tea of Heaven Poisonous Plants, Shrubs
Hydrangea spp. French hydrangea, Mountain hydrangea, oak-leaf hydrangea, peegee hydrangea Poisonous Plants
Hydrastis canadensis Golden seal Poisonous Plants
Hymenocallis caroliniana Spider lily Poisonous Plants, Water Garden
Hymenocallis crassifolia Spider lily Poisonous Plants, Water Garden
Hymenocallis occidentalis Spider lily Poisonous Plants, Wildflowers
Hymenocallis spp. Basket flower, Ismene, Peruvian daffodil, Sea daffodil, Spider lily Poisonous Plants, Summer Bulbs
Hyoscyamus niger Henbane, black henbane Poisonous Plants
Ilex opaca American Holly Native Plants, Poisonous Plants, Trees
Ilex vomitoria Yaupon holly Native Plants, Poisonous Plants, Shrubs, Trees
Illicium anisatum Japanese anise tree Poisonous Plants, Shrubs, Trees
Ipomoea tricolor Heavenly blue morning glory, Morning glory, Pearly gates morning glory Poisonous Plants, Vines
Iris brevicaulis Lamance iris, Short-stemmed iris Poisonous Plants, Wildflowers
Iris cristata Crested dwarf iris, Iris Native Plants, Perennials, Poisonous Plants, Wildflowers
Iris cristata alba White crested dwarf iris Poisonous Plants, Wildflowers
Iris ensata Japanese water iris Perennials, Poisonous Plants, Spring Bulbs, Water Garden
Iris germanica Bearded iris, German iris, Rhizomatous iris Perennials, Poisonous Plants, Summer Bulbs
Iris hexagona Dixie iris Poisonous Plants, Wildflowers
Iris hollandica Dutch Iris Poisonous Plants, Spring Bulbs
Iris reticulata Dwarf Iris, Species Iris Poisonous Plants, Spring Bulbs
Iris reticulata 'Harmony' Dwarf Iris, Species Iris Perennial Bulbs, Poisonous Plants
Iris spp. Iris Poisonous Plants
Iris tectorum Japanese roof iris, Roof iris, Wall iris Groundcover, Perennials, Poisonous Plants
Iris versicolor Larger blue flag iris Poisonous Plants, Wildflowers