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Scientific Name Common Name(s) Plant Category Image
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' Shrubs
Hypericum androsaemum 'Picasso' Shrubs
Hypericum androsaemum 'Pollock' 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
Ilex crenata 'Convexa' Convexa Japanese holly Shrubs
Ilex crenata 'Helleri' Helleri holly Shrubs
Ilex crenata 'Hetzii' Hetz's Japanese holly Shrubs
Ilex crenata 'Stokes' Japanese holly Shrubs
Ilex decidua Possum haw Holly, Possumhaw Holly Native Plants, Trees
Ilex glabra Inkberry Native Plants, Shrubs
Ilex hybrids Deciduous Holly hybrids Trees
Ilex latifolia Lusterleaf Holly Shrubs, Trees
Ilex montana Mountain holly Native Plants, Trees
Ilex opaca American Holly Native Plants, Poisonous Plants, Trees
Ilex pedunculosa Longstalk holly Trees
Ilex pernyi Perny holly Shrubs