32 Happy Flowers That Start With The Letter H

There are plenty of beautiful flowers that start with the letter 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

1. Habranthus (Rain Lily)

habranthus

  • 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)

half-flower

  • 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

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

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

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)

hebe

  • 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)

helenium

  • 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)

helianthemum

  • 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

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

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

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

hellebore

  • Scientific Name: Helleborus x hybridus
  • Sun: Partial shade, dappled sunlight, deep shade
  • Water: Keep soil moist
  • Size: 1-2 feet (30-60 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Poison Severity: None
  • Colors: Pink, red, burgundy, yellow, gold, green, purple, lavender, white

13. Hemp-Agrimony (Holy Rope)

hemp-agrimony

  • 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)

henbane

  • 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)

hepatica

  • 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

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

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

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)

hoary vervain

  • 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

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

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

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

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

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

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

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

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)

hummingbird's mint

  • 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

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)

haycinthoides

  • 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

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)

hypericum

  • 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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