“Explore a vibrant array of botanical diversity with ‘100 Flowers That Start With H’. From the delicate hues of hibiscus to the striking beauty of hydrangeas, this collection showcases nature’s floral wonders. Discover how each flower, from heliotropes to hellebores, captivates with unique shapes, colors, and fragrances, celebrating the rich tapestry of botanical marvels.”
Helenium
- Common Names: Sneezeweed, Helen’s Flower
- Family: Asteraceae
- Origin: Native to North and Central America
- Bloom Time: Late summer to fall
- Flower Colors: Yellow, red, orange
- Height: 1-5 feet
- Attracts: Butterflies and bees
- Care: Prefers full sun and well-drained soil
- Uses: Ornamental gardens, cut flowers
Helichrysum
- Common Names: Strawflower, Everlasting
- Family: Asteraceae
- Origin: Native to Africa, Madagascar, and Eurasia
- Bloom Time: Spring to summer
- Flower Colors: Yellow, white, pink, red
- Height: 1-3 feet
- Attracts: Butterflies
- Care: Prefers full sun and well-drained soil
- Uses: Dried flower arrangements, ornamental gardens
Hellebore
- Common Names: Christmas Rose, Lenten Rose
- Family: Ranunculaceae
- Origin: Native to Europe and Asia
- Bloom Time: Late winter to early spring
- Flower Colors: White, pink, purple, green
- Height: 1-2 feet
- Attracts: Bees
- Care: Prefers partial shade and well-drained soil
- Uses: Shade gardens, winter interest, ground cover
Heliconia
- Common Names: Lobster Claw, False Bird-of-Paradise
- Family: Heliconiaceae
- Origin: Native to tropical Americas, Pacific Islands
- Flower Structure: Distinctive, beak-like bracts in vibrant colors
- Bloom Time: Year-round in tropical climates
- Height: 3-20 feet
- Habitat: Requires warm temperatures, full sun, and moisture
- Uses: Tropical gardens, cut flowers
Heliotrope
- Common Names: Cherry Pie Plant
- Family: Boraginaceae
- Origin: Native to South America
- Flower Type: Clusters of tiny, fragrant purple, blue, or white blooms
- Bloom Time: Summer to fall
- Height: 1-3 feet
- Fragrance: Sweet, vanilla-like scent
- Care: Prefers full sun to partial shade, well-drained soil
Hepatica
- Common Names: Liverwort
- Family: Ranunculaceae
- Origin: Native to temperate regions of the Northern Hemisphere
- Bloom Time: Early spring
- Flower Colors: Blue, purple, white
- Height: 4-6 inches
- Habitat: Woodlands, prefers moist, well-drained soil
- Uses: Shade gardens, early season ground cover
Hibiscus
- Common Names: Rose Mallow, Shoeblackplant
- Family: Malvaceae
- Origin: Native to warm temperate, subtropical, and tropical regions
- Flower Type: Large, trumpet-shaped blooms in various colors
- Bloom Time: Summer to fall
- Height: 3-8 feet
- Care: Needs full sun, moist, well-drained soil
Hieracium
- Common Names: Hawkweed
- Family: Asteraceae
- Origin: Widely distributed in temperate regions worldwide
- Flower Type: Small, daisy-like flowers in clusters
- Bloom Time: Late spring to summer
- Height: Varies by species, typically low-growing
- Habitat: Meadows, grasslands, open woodlands
Hippeastrum
- Common Names: Amaryllis
- Family: Amaryllidaceae
- Origin: Native to tropical and subtropical regions of the Americas
- Flower Type: Large, trumpet-shaped blooms in various colors
- Bloom Time: Winter to spring indoors (forcing), or spring to summer outdoors
- Height: 12-36 inches
- Uses: Indoor and outdoor ornamental plant
Hosta
- Family: Asparagaceae (formerly in Liliaceae)
- Origin: East Asia, primarily Japan and Korea
- Foliage: Large, broad leaves in various shades of green, blue, and variegated patterns
- Flower Type: Bell-shaped, usually lavender or white
- Bloom Time: Summer
- Height: 6 inches to 3 feet
- Uses: Shade gardens, ground cover
Hyacinth
- Family: Asparagaceae
- Origin: Native to eastern Mediterranean region
- Flower Type: Dense spikes of fragrant, bell-shaped blooms
- Bloom Time: Early spring
- Colors: Purple, blue, pink, white, yellow
- Height: 6-12 inches
- Uses: Garden borders, containers, cut flowers
Hyacinthoides
- Common Names: Bluebell, Wood Hyacinth
- Family: Asparagaceae
- Origin: Native to Europe and Asia
- Flower Type: Bell-shaped flowers in clusters
- Bloom Time: Spring
- Colors: Blue, purple, pink, white
- Height: 8-20 inches
- Habitat: Woodlands, prefers partial shade
Hydrangea
- Family: Hydrangeaceae
- Origin: Native to Asia and the Americas
- Flower Type: Clusters of small flowers, often in large, showy heads
- Bloom Time: Summer to fall
- Colors: Pink, blue, purple, white, depending on soil pH
- Height: 3-6 feet
- Uses: Ornamental shrub, cut flowers
Hymenocallis
- Common Names: Spider Lily, Peruvian Daffodil
- Family: Amaryllidaceae
- Origin: Native to tropical and subtropical regions of the Americas
- Flower Type: Large, white, star-shaped blooms with long, slender petals
- Bloom Time: Late spring to summer
- Height: 1-3 feet
- Uses: Water gardens, tropical landscaping
Hypochaeris
- Common Names: Cat’s Ear, False Dandelion
- Family: Asteraceae
- Origin: Native to Europe, Asia, and North Africa
- Flower Type: Yellow, dandelion-like blooms in clusters
- Bloom Time: Spring to summer
- Height: 6-24 inches
- Habitat: Meadows, fields, disturbed areas
Hypericum
- Common Names: St. John’s Wort
- Family: Hypericaceae
- Origin: Native to temperate and subtropical regions worldwide
- Flower Type: Yellow, star-shaped blooms with prominent stamens
- Bloom Time: Summer
- Height: 1-6 feet
- Uses: Medicinal herb, ornamental garden plant
Hyssop
- Family: Lamiaceae
- Origin: Southern Europe, Middle East, Central Asia
- Flower Type: Spikes of small, tubular flowers
- Bloom Time: Summer to early fall
- Colors: Blue, pink, white
- Height: 1-2 feet
- Uses: Medicinal, culinary, ornamental
Hylotelephium
- Common Names: Stonecrop, Sedum
- Family: Crassulaceae
- Origin: Temperate regions of Northern Hemisphere
- Flower Type: Clusters of star-shaped flowers
- Bloom Time: Late summer to fall
- Colors: Pink, red, white
- Height: 6-24 inches
- Uses: Rock gardens, ground cover
Hypoxis
- Common Names: Star Grass, Yellow Star Grass
- Family: Hypoxidaceae
- Origin: Worldwide distribution
- Flower Type: Star-shaped, yellow flowers
- Bloom Time: Spring to summer
- Height: 4-12 inches
- Uses: Rock gardens, wildflower gardens
Hesperantha
- Common Names: River Lily
- Family: Iridaceae
- Origin: Southern Africa
- Flower Type: Star-shaped flowers
- Bloom Time: Late summer to fall
- Colors: Pink, red, white
- Height: 12-24 inches
- Uses: Borders, containers
Hesperis
- Common Names: Dame’s Rocket
- Family: Brassicaceae
- Origin: Europe, Asia
- Flower Type: Fragrant clusters of four-petaled flowers
- Bloom Time: Late spring to early summer
- Colors: Purple, pink, white
- Height: 2-4 feet
- Uses: Cottage gardens, wildflower meadows
Hesperocyparis
- Common Names: Cypress
- Family: Cupressaceae
- Origin: North America
- Flower Type: Cones
- Bloom Time: N/A (Conifer)
- Height: 30-70 feet
- Uses: Windbreaks, timber, ornamental
Heuchera
- Common Names: Coral Bells, Alumroot
- Family: Saxifragaceae
- Origin: North America
- Flower Type: Small, bell-shaped flowers on tall stems
- Bloom Time: Late spring to early summer
- Colors: Pink, red, white
- Height: 12-36 inches
- Uses: Shade gardens, borders
Heterocentron
- Common Names: Spanish Shawl
- Family: Melastomataceae
- Origin: Mexico, Central America
- Flower Type: Brightly colored, small flowers
- Bloom Time: Year-round in warm climates
- Colors: Pink, magenta
- Height: 6-12 inches
- Uses: Ground cover, hanging baskets
Heteromeles
- Common Names: Toyon, Christmas Berry
- Family: Rosaceae
- Origin: Western North America
- Flower Type: Small, white clusters
- Bloom Time: Summer
- Height: 6-30 feet
- Uses: Wildlife gardens, hedges
Holmskioldia
- Common Names: Chinese Hat Plant, Cup-and-Saucer Plant
- Family: Lamiaceae
- Origin: Himalayas
- Flower Type: Unique, cup-shaped flowers
- Bloom Time: Fall to winter
- Colors: Red, orange, yellow
- Height: 6-10 feet
- Uses: Ornamental, hedges
Hunnemannia
- Common Names: Mexican Tulip Poppy
- Family: Papaveraceae
- Origin: Mexico
- Flower Type: Large, yellow, poppy-like flowers
- Bloom Time: Summer to fall
- Height: 1-2 feet
- Uses: Borders, containers
Hylocereus
- Common Names: Dragon Fruit, Night-blooming Cereus
- Family: Cactaceae
- Origin: Central and South America
- Flower Type: Large, fragrant, night-blooming flowers
- Bloom Time: Summer
- Colors: White
- Height: Climbing cactus
- Uses: Edible fruit, ornamental
Haemanthus
- Common Names: Blood Lily, Paintbrush Lily
- Family: Amaryllidaceae
- Origin: Southern Africa
- Flower Type: Dense clusters of small flowers, often red
- Bloom Time: Late summer to fall
- Height: 6-18 inches
- Uses: Containers, rock gardens
Hakea
- Family: Proteaceae
- Origin: Australia
- Flower Type: Spiky, unusual flowers
- Bloom Time: Winter to spring
- Colors: White, pink, red
- Height: 3-20 feet
- Uses: Wildlife gardens, ornamental
Hamamelis
- Common Names: Witch Hazel
- Family: Hamamelidaceae
- Origin: North America, Asia
- Flower Type: Spidery, fragrant flowers
- Bloom Time: Winter to early spring
- Colors: Yellow, orange, red
- Height: 10-20 feet
- Uses: Shrub borders, winter interest
Hardenbergia
- Common Names: False Sarsaparilla, Purple Coral Pea
- Family: Fabaceae
- Origin: Australia
- Flower Type: Pea-like clusters
- Bloom Time: Winter to spring
- Colors: Purple, pink, white
- Height: 3-10 feet
- Uses: Climbers, ground cover
Hedychium
- Common Names: Ginger Lily
- Family: Zingiberaceae
- Origin: Asia
- Flower Type: Fragrant, showy spikes
- Bloom Time: Summer to fall
- Colors: White, yellow, orange
- Height: 3-6 feet
- Uses: Tropical gardens, fragrant gardens
Hedysarum
- Common Names: Sweetvetch
- Family: Fabaceae
- Origin: Temperate regions of Northern Hemisphere
- Flower Type: Pea-like flowers in spikes
- Bloom Time: Summer
- Colors: Pink, purple, red
- Height: 1-3 feet
- Uses: Wildflower meadows, pollinator gardens
Helipterum
- Common Names: Everlasting Daisy
- Family: Asteraceae
- Origin: Australia
- Flower Type: Paper-like, daisy flowers
- Bloom Time: Spring to summer
- Colors: White, pink, yellow
- Height: 6-18 inches
- Uses: Dried flowers, rock gardens
Heterotheca
- Common Names: Golden Aster
- Family: Asteraceae
- Origin: North America
- Flower Type: Daisy-like, yellow flowers
- Bloom Time: Summer to fall
- Height: 1-3 feet
- Uses: Wildflower gardens, pollinator gardens
Hibbertia
- Common Names: Guinea Flower
- Family: Dilleniaceae
- Origin: Australia
- Flower Type: Bright yellow, five-petaled flowers
- Bloom Time: Spring to summer
- Height: 1-3 feet
- Uses: Ground cover, rock gardens
Hieronymiella
- Family: Amaryllidaceae
- Origin: South America
- Flower Type: Umbels of small flowers
- Bloom Time: Summer
- Colors: White, pink
- Height: 1-2 feet
- Uses: Ornamental, botanical collections
Hilleria
- Family: Phyllanthaceae
- Origin: Tropical regions
- Flower Type: Small, inconspicuous flowers
- Bloom Time: Varies by species
- Height: Shrub or herbaceous
- Uses: Ornamental, medicinal
Hilliardia
- Family: Verbenaceae
- Origin: Southern Africa
- Flower Type: Small, tubular flowers in clusters
- Bloom Time: Summer to fall
- Colors: Purple, white
- Height: 1-2 feet
- Uses: Ornamental, borders
Hippophae
- Common Names: Sea Buckthorn
- Family: Elaeagnaceae
- Origin: Europe, Asia
- Flower Type: Small, inconspicuous flowers
- Bloom Time: Spring
- Height: 6-20 feet
- Uses: Edible berries, soil stabilization
Hoheria
- Common Names: Lacebark
- Family: Malvaceae
- Origin: New Zealand
- Flower Type: White, star-shaped flowers
- Bloom Time: Summer to fall
- Height: 10-30 feet
- Uses: Ornamental trees, hedges
Holarrhena
- Common Names: Ivory Tree
- Family: Apocynaceae
- Origin: Africa, Asia
- Flower Type: Fragrant, white flowers
- Bloom Time: Spring to summer
- Height: 10-20 feet
- Uses: Medicinal, ornamental
Homalocladium
- Common Names: Ribbon Bush
- Family: Polygonaceae
- Origin: New Guinea, Solomon Islands
- Flower Type: Small, greenish-white flowers
- Bloom Time: Year-round in warm climates
- Height: 6-10 feet
- Uses: Ornamental, unusual foliage
Homeria
- Family: Iridaceae
- Origin: South Africa
- Flower Type: Showy, six-petaled flowers
- Bloom Time: Spring to summer
- Colors: Yellow, orange, pink
- Height: 12-18 inches
- Uses: Ornamental, wildflower gardens
Homogyne
- Common Names: Cowslip
- Family: Asteraceae
- Origin: Europe
- Flower Type: Small, daisy-like flowers
- Bloom Time: Spring to summer
- Colors: Purple, pink
- Height: 6-12 inches
- Uses: Rock gardens, alpine gardens
Honckenya
- Common Names: Sea Sandwort
- Family: Caryophyllaceae
- Origin: Northern Hemisphere coastal regions
- Flower Type: Small, white flowers
- Bloom Time: Summer
- Height: 2-6 inches
- Uses: Coastal gardens, ground cover
Hordeum
- Common Names: Barley
- Family: Poaceae
- Origin: Temperate regions worldwide
- Flower Type: Grass inflorescences
- Bloom Time: Spring to summer
- Height: 2-4 feet
- Uses: Agriculture, ornamental grasses
Horminum
- Common Names: Dragon’s Mouth
- Family: Lamiaceae
- Origin: Europe
- Flower Type: Tubular, purple flowers
- Bloom Time: Summer
- Height: 6-12 inches
- Uses: Rock gardens, borders
Houttuynia
- Common Names: Chameleon Plant
- Family: Saururaceae
- Origin: Southeast Asia
- Flower Type: Small, white spikes
- Bloom Time: Late spring to summer
- Height: 6-12 inches
- Uses: Ground cover, water gardens
Humulus
- Common Names: Hops
- Family: Cannabaceae
- Origin: Europe, Asia, North America
- Flower Type: Cone-like structures
- Bloom Time: Summer
- Height: Climbing vine
- Uses: Brewing, ornamental
Hyacinthoides non-scripta
- Common Names: English Bluebell
- Family: Asparagaceae
- Origin: Western Europe
- Flower Type: Bell-shaped, nodding flowers
- Bloom Time: Spring
- Colors: Blue, occasionally white
- Height: 10-18 inches
- Uses: Woodland gardens, naturalizing
Hymenocallis narcissiflora
- Common Names: Spider Lily
- Family: Amaryllidaceae
- Origin: South America
- Flower Type: Large, white, spider-like flowers
- Bloom Time: Summer to fall
- Height: 1-3 feet
- Uses: Water gardens, tropical landscaping
Hyoseris
- Family: Asteraceae
- Origin: Europe, North Africa, Asia
- Flower Type: Yellow, dandelion-like flowers
- Bloom Time: Spring to summer
- Height: 6-18 inches
- Uses: Rock gardens, wildflower gardens
Hypochaeris radicata
- Common Names: Cat’s Ear, False Dandelion
- Family: Asteraceae
- Origin: Europe, North Africa
- Flower Type: Yellow, dandelion-like flowers
- Bloom Time: Spring to fall
- Height: 6-24 inches
- Uses: Wildflower meadows, pollinator gardens
Hypoxis hirsuta
- Common Names: Yellow Star Grass
- Family: Hypoxidaceae
- Origin: North America
- Flower Type: Star-shaped, yellow flowers
- Bloom Time: Spring to summer
- Height: 4-12 inches
- Uses: Rock gardens, wildflower gardens
Hyptis
- Family: Lamiaceae
- Origin: Tropical and subtropical regions
- Flower Type: Small, fragrant flowers
- Bloom Time: Year-round in warm climates
- Height: 1-6 feet
- Uses: Ornamental, medicinal
Hypericum perforatum
- Common Names: St. John’s Wort
- Family: Hypericaceae
- Origin: Europe, Asia
- Flower Type: Yellow, star-shaped flowers
- Bloom Time: Summer
- Height: 1-3 feet
- Uses: Medicinal, ornamental
Hypoxis rooperi
- Common Names: Yellow Star Grass
- Family: Hypoxidaceae
- Origin: Southern Africa
- Flower Type: Star-shaped, yellow flowers
- Bloom Time: Spring to summer
- Height: 6-12 inches
- Uses: Rock gardens, wildflower gardens
Helichrysum bracteatum
- Common Names: Strawflower, Everlasting Flower
- Family: Asteraceae
- Origin: Australia
- Flower Type: Paper-like, daisy flowers
- Bloom Time: Summer to fall
- Colors: White, yellow, orange, pink, red
- Height: 12-36 inches
- Uses: Dried flowers, borders
Hesperis matronalis
- Common Names: Dame’s Rocket
- Family: Brassicaceae
- Origin: Europe, Asia
- Flower Type: Fragrant clusters of four-petaled flowers
- Bloom Time: Late spring to early summer
- Colors: Purple, pink, white
- Height: 2-4 feet
- Uses: Cottage gardens, wildflower meadows
Hibiscus rosa-sinensis
- Common Names: Chinese Hibiscus, Tropical Hibiscus
- Family: Malvaceae
- Origin: Asia
- Flower Type: Large, showy flowers
- Bloom Time: Year-round in warm climates
- Colors: Red, pink, orange, yellow, white
- Height: 4-15 feet
- Uses: Ornamental, hedges
Hydrangea macrophylla
- Common Names: Bigleaf Hydrangea, Mophead Hydrangea
- Family: Hydrangeaceae
- Origin: Japan
- Flower Type: Large clusters of small flowers
- Bloom Time: Summer to fall
- Colors: Blue, pink, white, purple
- Height: 3-6 feet
- Uses: Borders, containers
Hymenocallis littoralis
- Common Names: Spider Lily
- Family: Amaryllidaceae
- Origin: Central and South America
- Flower Type: Large, white, spider-like flowers
- Bloom Time: Summer to fall
- Height: 1-3 feet
- Uses: Water gardens, tropical landscaping
Hyacinthus orientalis
- Common Names: Hyacinth
- Family: Asparagaceae
- Origin: Eastern Mediterranean
- Flower Type: Dense spikes of fragrant flowers
- Bloom Time: Spring
- Colors: Blue, purple, pink, white, yellow
- Height: 6-12 inches
- Uses: Borders, containers
Hypericum androsaemum
- Common Names: Tutsan
- Family: Hypericaceae
- Origin: Europe, Asia
- Flower Type: Yellow, star-shaped flowers
- Bloom Time: Summer
- Height: 2-3 feet
- Uses: Ornamental, medicinal
Hypoestes phyllostachya
- Common Names: Polka Dot Plant
- Family: Acanthaceae
- Origin: Madagascar
- Flower Type: Small, inconspicuous flowers
- Bloom Time: Summer
- Height: 6-12 inches
- Uses: Houseplant, ornamental
Hosta plantaginea
- Common Names: Fragrant Plantain Lily
- Family: Asparagaceae
- Origin: China
- Flower Type: Large, fragrant, white flowers
- Bloom Time: Late summer
- Height: 1-2 feet
- Uses: Shade gardens, borders
Helianthus annuus
- Common Names: Sunflower
- Family: Asteraceae
- Origin: North America
- Flower Type: Large, daisy-like flowers
- Bloom Time: Summer to fall
- Colors: Yellow, red, orange
- Height: 3-10 feet
- Uses: Edible seeds, ornamental
Heuchera sanguinea
- Common Names: Coral Bells, Alumroot
- Family: Saxifragaceae
- Origin: North America
- Flower Type: Small, bell-shaped flowers on tall stems
- Bloom Time: Late spring to early summer
- Colors: Pink, red, white
- Height: 12-36 inches
- Uses: Shade gardens, borders
Hesperaloe parviflora
- Common Names: Red Yucca
- Family: Asparagaceae
- Origin: Texas, Northern Mexico
- Flower Type: Tubular, red or pink flowers on tall spikes
- Bloom Time: Spring to summer
- Height: 3-5 feet
- Uses: Xeriscaping, rock gardens
Heptacodium miconioides
- Common Names: Seven-son Flower
- Family: Caprifoliaceae
- Origin: China
- Flower Type: Clusters of small, fragrant white flowers
- Bloom Time: Late summer to fall
- Height: 10-20 feet
- Uses: Ornamental, late-season interest
Hoya carnosa
- Common Names: Wax Plant, Porcelain Flower
- Family: Apocynaceae
- Origin: Eastern Asia, Australia
- Flower Type: Star-shaped, waxy flowers
- Bloom Time: Year-round in warm climates
- Colors: White, pink
- Height: Climbing or trailing vine
- Uses: Houseplant, ornamental
Heliopsis helianthoides
- Common Names: False Sunflower
- Family: Asteraceae
- Origin: North America
- Flower Type: Daisy-like, yellow flowers
- Bloom Time: Summer to fall
- Height: 3-5 feet
- Uses: Borders, wildflower gardens
Hemerocallis fulva
- Common Names: Tawny Daylily
- Family: Asphodelaceae
- Origin: Asia
- Flower Type: Trumpet-shaped, orange flowers
- Bloom Time: Summer
- Height: 2-4 feet
- Uses: Borders, mass plantings
Heterocentron elegans
- Common Names: Spanish Shawl
- Family: Melastomataceae
- Origin: Mexico, Central America
- Flower Type: Brightly colored, small flowers
- Bloom Time: Year-round in warm climates
- Colors: Pink, magenta
- Height: 6-12 inches
- Uses: Ground cover, hanging baskets
Humulus lupulus
- Common Names: Common Hops
- Family: Cannabaceae
- Origin: Europe, Asia, North America
- Flower Type: Cone-like structures
- Bloom Time: Summer
- Height: Climbing vine
- Uses: Brewing, ornamental
Hosta sieboldiana
- Common Names: Siebold’s Plantain Lily
- Family: Asparagaceae
- Origin: Japan
- Flower Type: Large, fragrant, white flowers
- Bloom Time: Summer
- Height: 1-2 feet
- Uses: Shade gardens, borders
Heliconia rostrata
- Common Names: Lobster Claw, Hanging Heliconia
- Family: Heliconiaceae
- Origin: Central and South America
- Flower Type: Large, hanging, colorful bracts
- Bloom Time: Year-round in warm climates
- Colors: Red, yellow, orange
- Height: 3-10 feet
- Uses: Tropical landscaping, cut flowers
Hydrangea paniculata
- Common Names: Panicle Hydrangea
- Family: Hydrangeaceae
- Origin: China, Japan, Russia
- Flower Type: Large, cone-shaped clusters of small flowers
- Bloom Time: Summer to fall
- Colors: White, pink
- Height: 6-15 feet
- Uses: Borders, hedges
Hypericum calycinum
- Common Names: Aaron’s Beard, Rose of Sharon
- Family: Hypericaceae
- Origin: Southeastern Europe, Turkey
- Flower Type: Large, yellow, star-shaped flowers
- Bloom Time: Summer
- Height: 1-2 feet
- Uses: Ground cover, ornamental
Hyacinthoides hispanica
- Common Names: Spanish Bluebell
- Family: Asparagaceae
- Origin: Iberian Peninsula
- Flower Type: Bell-shaped, nodding flowers
- Bloom Time: Spring
- Colors: Blue, pink, white
- Height: 10-18 inches
- Uses: Woodland gardens, naturalizing
Hibiscus moscheutos
- Common Names: Swamp Rose Mallow
- Family: Malvaceae
- Origin: North America
- Flower Type: Large, showy flowers
- Bloom Time: Summer to fall
- Colors: White, pink, red
- Height: 3-7 feet
- Uses: Water gardens, borders
Hesperantha coccinea
- Common Names: Scarlet River Lily
- Family: Iridaceae
- Origin: South Africa
- Flower Type: Brightly colored, star-shaped flowers
- Bloom Time: Late summer to fall
- Colors: Red, pink, white
- Height: 12-24 inches
- Uses: Borders, rock gardens
Helianthus tuberosus
- Common Names: Jerusalem Artichoke
- Family: Asteraceae
- Origin: North America
- Flower Type: Large, yellow, daisy-like flowers
- Bloom Time: Late summer to fall
- Height: 6-10 feet
- Uses: Edible tubers, ornamental
Hylocereus undatus
- Common Names: Dragon Fruit, Pitaya
- Family: Cactaceae
- Origin: Central and South America
- Flower Type: Large, white, night-blooming flowers
- Bloom Time: Summer
- Height: Climbing cactus
- Uses: Edible fruit, ornamental
Hedera helix
- Common Names: English Ivy
- Family: Araliaceae
- Origin: Europe, Western Asia
- Flower Type: Small, greenish-yellow flowers
- Bloom Time: Fall
- Height: Climbing or trailing vine
- Uses: Ground cover, walls, fences
Hemerocallis lilioasphodelus
- Common Names: Lemon Daylily
- Family: Asphodelaceae
- Origin: Asia
- Flower Type: Trumpet-shaped, yellow flowers
- Bloom Time: Spring to summer
- Height: 2-3 feet
- Uses: Borders, mass plantings
Humiria balsamifera
- Family: Humiriaceae
- Origin: South America
- Flower Type: Small, fragrant, white flowers
- Bloom Time: Year-round in warm climates
- Height: 10-30 feet
- Uses: Ornamental, timber
Hemizonia pungens
- Common Names: Common Spikeweed
- Family: Asteraceae
- Origin: North America
- Flower Type: Yellow, daisy-like flowers
- Bloom Time: Summer to fall
- Height: 1-3 feet
- Uses: Wildflower gardens, pollinator gardens
Holodiscus discolor
- Common Names: Oceanspray
- Family: Rosaceae
- Origin: North America
- Flower Type: Cascading clusters of small, white flowers
- Bloom Time: Late spring to summer
- Height: 3-15 feet
- Uses: Wildlife gardens, ornamental
Hakea laurina
- Common Names: Pincushion Hakea
- Family: Proteaceae
- Origin: Australia
- Flower Type: Globular, pincushion-like flowers
- Bloom Time: Winter to spring
- Colors: Red, pink
- Height: 10-20 feet
- Uses: Ornamental, hedges
Hakea sericea
- Common Names: Silky Hakea
- Family: Proteaceae
- Origin: Australia
- Flower Type: Small, white flowers in clusters
- Bloom Time: Winter to spring
- Height: 6-12 feet
- Uses: Ornamental, hedges
Hesperocyparis macrocarpa
- Common Names: Monterey Cypress
- Family: Cupressaceae
- Origin: North America
- Flower Type: Small, inconspicuous cones
- Bloom Time: Spring
- Height: 40-70 feet
- Uses: Windbreaks, ornamental
Hesperaloe funifera
- Common Names: Coahuilan Hesperaloe
- Family: Asparagaceae
- Origin: Mexico
- Flower Type: Tubular, white flowers on tall spikes
- Bloom Time: Spring to summer
- Height: 4-6 feet
- Uses: Xeriscaping, rock gardens
Hypericum olympicum
- Common Names: Olympic St. John’s Wort
- Family: Hypericaceae
- Origin: Southeastern Europe
- Flower Type: Yellow, star-shaped flowers
- Bloom Time: Summer
- Height: 6-12 inches
- Uses: Rock gardens, borders