Plant WitchPlants: H
- Haageana Globe Amaranth Gomphrena haageana Garden annual
- Hairy Beardtongue Penstemon hirsutus Wildflower
- Hairy Goldenaster Heterotheca villosa Wildflower
- Hairy Manzanita Arctostaphylos columbiana Flowering shrub
- Hairy Mountain Mint Pycnanthemum verticillatum var. pilosum
- Hairy Vetch Vicia villosa Legume
- Hairy Wood Mint Blephilia hirsuta
- Halberd-Leaf Rosemallow Hibiscus laevis Garden perennial
- Hard Fescue Festuca brevipila Grass
- Hardy Begonia Begonia grandis Creeping perennial
- Hardy Cyclamen Cyclamen hederifolium Garden perennial
- Hardy Fuchsia Fuchsia magellanica Flowering shrub
- Hardy Ice Plant Delosperma cooperi Creeping perennial
- Hardy Kiwi Actinidia arguta Berry
- Hare's Ear Bupleurum rotundifolium Garden annual
- Harebell Campanula rotundifolia Wildflower
- Harlequin Flower Sparaxis tricolor Bulb
- Harlequin Glorybower Clerodendrum trichotomum Flowering shrub
- Hartweg's Sundrops Calylophus hartwegii Creeping perennial
- Harvest Brodiaea Brodiaea coronaria Wildflower
- Hay-Scented Fern Dennstaedtia punctilobula Fern
- Hazelnut Corylus avellana Nut
- Heart-Leaved Aster Symphyotrichum cordifolium Wildflower
- Heart-Leaved Golden Alexanders Zizia aptera Wildflower
- Heartleaf Bergenia Bergenia cordifolia Creeping perennial
- Heartleaf Keckiella Keckiella cordifolia Flowering shrub
- Heartleaf Milkweed Asclepias cordifolia Wildflower
- Heartleaf Willow Salix eriocephala
- Heath Aster Symphyotrichum ericoides Wildflower
- Heather Calluna vulgaris Low shrub
- Heavenly Blue Morning Glory Ipomoea tricolor Garden annual
- Heliotrope Heliotropium arborescens Flowering shrub
- Henderson's Shooting Star Dodecatheon hendersonii Wildflower
- Henry's Lily Lilium henryi Garden perennial
- Hens And Chicks Sempervivum tectorum Creeping perennial
- Herald's Trumpet Beaumontia grandiflora Vine
- Hercules' Club Zanthoxylum clava-herculis
- Higan Cherry Prunus × subhirtella Flowering tree
- High Mallow Malva sylvestris Wildflower
- Himalayan Blue Poppy Meconopsis betonicifolia Garden perennial
- Himalayan Cinquefoil Potentilla atrosanguinea Garden perennial
- Himalayan Cranesbill Geranium himalayense Garden perennial
- Himalayan Fleeceflower Persicaria affinis Creeping perennial
- Hoary Mountain Mint Pycnanthemum incanum
- Hoary Tansyaster Machaeranthera canescens Wildflower
- Hoary Vervain Verbena stricta Wildflower
- Hollow Joe Pye Weed Eutrochium fistulosum Wildflower
- Hollyhock Alcea rosea
- Hollyhock Mallow Malva alcea Wildflower
- Hollyleaf Cherry Prunus ilicifolia Flowering shrub
- Hollyleaf Redberry Rhamnus ilicifolia
- Honesty Lunaria annua Garden annual
- Honey Locust Gleditsia triacanthos Legume
- Honey Mesquite Prosopis glandulosa Legume
- Honeysuckle Fuchsia Fuchsia triphylla Garden perennial
- Honeywort Cerinthe major Garden annual
- Hong Kong Orchid Tree Bauhinia × blakeana Flowering tree
- Hookedspur Violet Viola adunca Wildflower
- Hooker's Balsamroot Balsamorhiza hookeri Wildflower
- Hooker's Willow Salix hookeriana Flowering shrub
- Hoop Petticoat Daffodil Narcissus bulbocodium Bulb
- Hops Humulus lupulus Herb
- Horned Violet Viola cornuta Garden perennial
- Horseflyweed Baptisia tinctoria Legume
- Horseherb Calyptocarpus vialis Creeping perennial
- Horseradish Armoracia rusticana Root
- Humboldt Lily Lilium humboldtii Bulb
- Hummingbird Mint Agastache cana Garden perennial
- Hummingbird Sage Salvia spathacea
- Hummingbird Trumpet Epilobium canum Wildflower
- Hyacinth Hyacinthus orientalis Bulb
- Hyacinth Bean Lablab purpureus Legume
- Hybrid Anemone Anemone × hybrida Garden perennial
- Hybrid Bougainvillea Bougainvillea × buttiana Vine
- Hybrid Columbine Aquilegia × hybrida Garden perennial
- Hybrid Delphinium Delphinium elatum Garden perennial
- Hybrid Fuchsia Fuchsia hybrida
- Hybrid Sage Salvia × sylvestris Garden perennial
- Hybrid Stonecrop Phedimus hybridus Creeping perennial
- Hybrid Trumpet Creeper Campsis × tagliabuana Vine
- Hybrid Witch Hazel Hamamelis × intermedia Flowering shrub
- Hyssop Hyssopus officinalis Herb
- Hyssopleaf Boneset Eupatorium hyssopifolium