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:
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
- 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)
- 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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