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Scientific Name Common Name(s) Plant Category Image
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 Shrubs
Hydrangea arborescens 'NCHA2' PPAF Invincibelle™ Spirit II Mountain Hydrangea, Mountain hydrangea Shrubs
Hydrangea arborescens 'NCHA3' PPAF Invincibelle™ Ruby Mountain Hydrangea Shrubs
Hydrangea arborescens 'NCHA4' PPAF Incrediball™ Blush Mountain Hydrangea Shrubs
Hydrangea macrophylla Bigleaf hydrangea Poisonous Plants, Shrubs
Hydrangea macrophylla ‘Glowing Embers’ Glowing embers hydrangea Shrubs
Hydrangea paniculata Panicle hydrangea, Peegee hydrangea Poisonous Plants, Shrubs, Trees
Hydrangea paniculata ‘Limelight’ PP #12874 Limelight hydrangea Perennials, Shrubs
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
Hydrocleys nymphoides Water poppy Water Garden
Hydrocotyle americana Water pennywort Water Garden
Hydrocotyle umbellate Marsh pennywort Wildflowers
Hylotelephium sieboldii Japanese stonecrop Groundcover, Perennials
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
Hypericum androsaemum 'Matisse' Expressionistic™ Tutsans, Tutsans Shrubs
Hypericum androsaemum 'Picasso' Expressionistic™ Tutsans Shrubs
Hypericum androsaemum 'Pollock' Expressionistic™ Tutsans, Tutsans Shrubs
Hypericum calycinum Aaron's beard, St. John's wort Groundcover
Hypericum galioides Bedstraw St. John's wort Shrubs
Hypericum kalmianum Kalm's St. John's wort Shrubs
Hypericum perforatum Common St. John's-wort Wildflowers
Hypericum prolificum Shrubby St. John's wort, St. John's wort Native Plants, Shrubs
Hypochoeris radicata Cat's ear Wildflowers
Hypoestes phyllostachya Freckle face, Polka dot plant Annuals
Hypolepis repens Bramble fern Ferns
Hypoxis hirsuta Yellow star-grass Wildflowers
Hyssopus officinalis Hyssop Edible Plants, Herbs
Iberis amara Candytuft (annual) Annuals
Iberis sempervirens Candytuft, Evergreen candytuft Groundcover, Perennials
Iberis umbellata Annual candytuft, Globe candytuft Annuals
Ilex aquifolium English holly Shrubs, Trees
Ilex cassine Dahoon Holly Native Plants, Trees
Ilex cornuta Chinese holly Shrubs, Trees
Ilex cornuta 'Burfordii' Burford holly Shrubs
Ilex cornuta 'Carissa' Carissa holly Shrubs
Ilex cornuta 'D'Or' D'Or Chinese holly Shrubs
Ilex cornuta 'O'Spring' O'Spring Chinese holly Shrubs
Ilex cornuta 'Rotunda' Dwarf Chinese holly Shrubs
Ilex crenata Japanese holly Shrubs