32 Happy Flowers That Start With H (2024)

Last Updated: January 4, 2023

There are plenty of beautiful flowers that start with H. Take a look at this list full of colorful flowers that will bring beauty to your flower bed.

In this list, you'll find all the important information you need to keep these plants alive, including if they're toxic, the lowest temperatures they can survive, and their preferred moisture and sunlight levels.

To learn more about the various flowers available for your garden, make sure to check out our list of “Flower Names A to Z”.

Flowers That Start With H:

Quick Look

Habranthus (Rain Lily)
Half-Flower (Beach Naupaka)
Hawthorn
Heath
Heather
Hebe (Showy Speedwell)
Helenium (Sneezeweed)
Helianthemum (Rock Rose)
Heliconia
Heliopsis
Heliotrope
Hellebore
Hemp-Agrimony (Holy Rope)
Henbane (Stinking Nightshade)
Hepatica (Liverwort)
Heucherella

Hibiscus
High Mallow
Hoary Vervain (Hoary Verbena)
Hollow Root
Hollyhock
Honesty
Honeysuckle
Hooded Pitcher Plant
Hooker's Orchid Cactus
Horned Violet
Hosta
Hummingbird's Mint (Hyssop)
Hyacinth
Hyacinthoides (Bluebells)
Hydrangea
Hypericum (St. John's Wort)

1. Habranthus (Rain Lily)

Scientific Name: Habranthus
Sun: Full sun, partial shade
Water: Keep soil moist
Size: 6-12 inches (15-30 centimeters)
Lowest Temperature: 50°F (10°C)
Poison Severity: Low
Colors: Pink, red, burgundy, yellow, gold, brown, copper, white

2. Half-Flower (Beach Naupaka)

Scientific Name: Scaevola taccada
Sun: Full sun
Water: Keep soil moist
Size: 3-10 feet (0.91-3 meters)
Lowest Temperature: 30°F (-1.1°C)
Poison Severity: None
Colors: Purple, white

3. Hawthorn

Scientific Name: Rhaphiolepis
Sun: Full sun, partial shade
Water: Somewhat drought tolerant
Size: 3-12 feet (0.91-3.6 meters)
Lowest Temperature: 10°F (-12°C)
Poison Severity: None
Colors: Pink, white

4. Heath

Scientific Name: Epacris longiflora
Sun: Partial shade
Water: Keep soil moist
Size: 1-6 feet (0.3-1.8 meters)
Lowest Temperature: Can survive cool but not cold temperatures
Poison Severity: None
Colors: Pink, white

5. Heather

Scientific Name: Cassiope
Sun: Full sun, partial shade, can't tolerate direct afternoon sun
Water: Keep soil moist
Size: 6-9 inches (15-22 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: White

6. Hebe (Showy Speedwell)

Scientific Name: Hebe speciosa
Sun: Full sun, partial shade
Water: Allow soil to dry slightly between waterings
Size: 2-3 feet (60-91 centimeters)
Lowest Temperature: 10°F (-12°C)
Poison Severity: None
Colors: Purple, pink, white

7. Helenium (Sneezeweed)

Scientific Name: Helenium
Sun: Full sun
Water: Keep soil moist
Size: 1-3 feet (30-91 centimeters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: Medium
Colors: Red, orange, yellow

8. Helianthemum (Rock Rose)

Scientific Name: Helianthemum
Sun: Full sun
Water: Drought tolerant
Size: 6-12 inches (15-30 centimeters)
Lowest Temperature: -20°F (-28°C)
Poison Severity: None
Colors: Orange, yellow, pink

9. Heliconia

Scientific Name: Heliconia
Sun: Full sun, partial shade, prefers afternoon shade
Water: Keep soil moist
Size: 6-8 feet (1.8-2.4 meters)
Lowest Temperature: 10°F (-12°C)
Poison Severity: None
Colors: Red, yellow

10. Heliopsis

Scientific Name: Heliopsis
Sun: Full sun, partial shade
Water: Keep soil most, partial drought tolerance
Size: 3-5 feet (0.91-1.5 meters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: None
Colors: Orange, yellow, gold, brown, copper

11. Heliotrope

Scientific Name: Heliotropium
Sun: Full sun, partial shade
Water: Keep soil moist
Size: 1-3 feet (30-91 centimeters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: Medium
Colors: Blue, purple, lavender, white

12. Hellebore

13. Hemp-Agrimony (Holy Rope)

Scientific Name: Eupatorium cannabinum
Sun: Full sun, partial shade
Water: Keep soil moist
Size: Up to 5 feet (1.5 meters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Pink, purple, white

14. Henbane (Stinking Nightshade)

Scientific Name: Hyoscyamus niger
Sun: Full sun, partial shade
Water: Keep soil moist, drought tolerant
Size: Up to 3 feet (91 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: Highly toxic, eating any part of the plant may be fatal
Colors: Yellow, gold, green, purple, lavender

15. Hepatica (Liverwort)

Scientific Name: Hepatica
Sun: Partial shade, dappled sunlight
Water: Keep soil moist
Size: 4-9 inches (10-22 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Pink, green, blue, purple, lavender, white

16. Heucherella

Scientific Name: x Heucherella tiarelloides
Sun: Full sun, partial sun
Water: Keep soil moist
Size: 7-16 inches (17-40 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Pink, white

17. Hibiscus

Scientific Name: Hibiscus rosa-sinesis
Sun: Full sun, partial shade
Water: Keep soil moist, partial drought tolerance
Size: 4-10 feet (1-3 meters)
Lowest Temperature: 25°F (-3.8°C)
Poison Severity: None
Colors: Pink, red, yellow, gold

18. High Mallow

Scientific Name: Malva sylvestris
Sun: Full sun, partial shade
Water: Keep soil moist
Size: 2-4 feet (60-121 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Purple shades ranging from reddish to bluish

19. Hoary Vervain (Hoary Verbena)

Scientific Name: Verbena stricta
Sun: Full sun
Water: Keep soil moist or slightly dry
Size: 2-4 feet (60-121 centimeters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Blue, purple, lavender

20. Hollow Root

Scientific Name: Corydalis cava
Sun: Partial shade
Water: Keep soil moist
Size: Up to 8 inches (20 centimeters)
Lowest Temperature: -20°F (-28°C)
Poison Severity: Potentially toxic, but not confirmed
Colors: Pink, purple, white

21. Hollyhock

Scientific Name: Alcea rosea
Sun: Full sun
Water: Keep soil moist or slightly dry
Size: 5-8 feet (1.5-2.4 meters)
Lowest Temperature: -45°F (-42.7°C)
Poison Severity: None
Colors: Pink, red, burgundy, orange, yellow, gold, purple, lavender, white

22. Honesty

Scientific Name: Lunaria annua
Sun: Full sun, partial shade
Water: Keep soil moist
Size: 2-3 feet (60-91 centimeters)
Lowest Temperature: -20°F (-28°C)
Poison Severity: None
Colors: Pink, purple, lavender, white

23. Honeysuckle

Scientific Name: Lonicera
Sun: Full sun, partial shade, dappled shade
Water: Keep soil moist
Size: Up to 19 feet (5.7 meters)
Lowest Temperature: -30°F (-34°C)
Poison Severity: None
Colors: Pink, cream

24. Hooded Pitcher Plant

Scientific Name: Sarracenia minor
Sun: Full sun
Water: Consistently wet
Size: 1-2 feet (30-60 centimeters)
Lowest Temperature: -10°F (-23.3°C)
Poison Severity: None
Colors: Yellow, gold, green, purple, lavender, white

25. Hooker's Orchid Cactus

Scientific Name: Epiphyllum hookeri
Sun: Bright indirect light
Water: Allow soil to dry between waterings
Size: 2-4 feet (60-121 centimeters)
Lowest Temperature: 40°F (4.4°C)
Poison Severity: None
Colors: White

26. Horned Violet

Scientific Name: Viola cornuta
Sun: Full sun, partial shade
Water: Keep soil moist
Size: 6-9 inches (15-22 centimeters)
Lowest Temperature: -10°F (-23.3°C)
Poison Severity: None
Colors: Yellow, gold, blue, purple, lavender, white, variegated

27. Hosta

Scientific Name: Hosta
Sun: Partial shade, full shade
Water: Water regularly
Size: 1.5-2.5 feet (45-76 centimeters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: None
Colors: Purple, lavender, white

28. Hummingbird's Mint (Hyssop)

Scientific Name: Agastache
Sun: Full sun
Water: Keep soil moist or slightly dry
Size: 2-4 feet (60-121 centimeters)
Lowest Temperature: -20°F (-28°C)
Poison Severity: None
Colors: Pink, red, burgundy, blue, purple, lavender, white

29. Hyacinth

Scientific Name: Hyacinthus orientalis
Sun: Full sun, partial shade
Water: Keep soil moist at planting, can adapt to dry soil at maturity
Size: 8-12 inches (20-30 centimeters)
Lowest Temperature: -25°F (-31.6°C)
Poison Severity: Medium
Colors: Pink, red, burgundy, orange, yellow, gold, blue, purple, lavender, white

30. Haycinthoides (Bluebells)

Scientific Name: Hyacinthoides hispanica
Sun: Full sun, partial shade, full shade
Water: Keep soil moist
Size: 6-18 inches (15-45 centimeters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: Highly toxic, eating any part of the plant may be fatal
Colors: Pink, blue, purple, lavender

31. Hydrangea

Scientific Name: Hydrangea
Sun: Full sun, partial shade
Water: Keep soil moist, occasionally wet
Size: Up to 15 feet (4.5 meters)
Lowest Temperature: -40°F (-40°C)
Poison Severity: Low
Colors: Pink, blue, purple, lavender, white

32. Hypericum (St. John's Wort)

Scientific Name: Hypericum
Sun: Full sun, partial shade
Water: Keep soil moist
Size: Up 3 feet (1 meter)
Lowest Temperature: -10°F (-23.3°C)
Poison Severity: Low
Colors: Yellow

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