27 Flowers That Start With The Letter I

There are many beautiful flowers that start with I that you can add to your garden. This list of plants ranges from cold weather to hot weather species, so everyone should be able to find something that will suit their garden.

We included the important information you need to decide if you can grow these plants yourself in this list of flowers.

Flowers That Start With I:

Quick Look

  1. Iberis (Candytuft)
  2. Ice Blue Calathea
  3. Ice Plant
  4. Iceland Poppy
  5. Ilex (Holly)
  6. Impatiens
  7. Incarvillea
  8. Inch Plant
  9. Indian Blanket
  10. Indian Paintbrush
  11. Indian Pink
  12. Indian Shot
  13. Indigo Plant
  14. Inula
  15. Ipheion uniflorum (Springstar)
  16. Ipomoea (Morning Glory)
  17. Ipomopsis (Standing Cypress)
  18. Iris
  19. Ironweed (Little Ironweed)
  20. Isatis
  21. Isoplexis
  22. Italian Aster
  23. Ivy
  24. Ivyleaf Geranium
  25. Ixia
  26. Ixiolirion tataricum (Siberian Lily)
  27. Ixora

1. Iberis (Candytuft)

iberis

  • Scientific Name: Iberis sempervirens
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: 9-12 inches (22-30 centimeters)
  • Lowest Temperature: -35°F (-37.2°C)
  • Toxicity: None
  • Colors: Pink, white

2. Ice Blue Calathea

ice blue calathea

  • Scientific Name: Calathea burle-marxii
  • Sun: Partial shade, full shade
  • Water: Keep soil moist; best suited for humid conditions
  • Size: Up to 5 feet (1.5 meters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None
  • Colors: Blue, white

3. Ice Plant

ice plant

  • Scientific Name: Delosperma cooperi
  • Sun: Full sun
  • Water: Drought tolerant, keep soil dry, needs good drainage
  • Size: 3-6 inches (7-15 centimeters)
  • Lowest Temperature: -10°F (-23.3°C)
  • Toxicity: None
  • Colors: Pink, purple, lavender

4. Iceland Poppy

iceland poppy

  • Scientific Name: Papaver nudicaule
  • Sun: Full sun, afternoon shade in hot climates
  • Water: Keep soil evenly moist
  • Size: 1-2 feet (30-60 centimeters)
  • Lowest Temperature: -50°F (-45.5°C)
  • Toxicity: None
  • Colors: Pink, orange, yellow, white

5. Ilex (Holly)

ilex

  • Scientific Name: Ilex aquifolium
  • Sun: Full sun, partial shade
  • Water: Allow soil to dry between waterings
  • Size: 30-50 feet (9-15 meters)
  • Lowest Temperature: -15°F (-26.1°C)
  • Toxicity: Low
  • Colors: Green, white

6. Impatiens

impatiens

  • Scientific Name: Impatiens walleriana
  • Sun: Partial shade, dappled shade, deep shade
  • Water: Keep soil moist
  • Size: 0.5-2 feet (15-60 centimeters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None-
  • Colors: Pink, red, burgundy, orange, purple, lavender, white

7. Incarvillea

incarvillea

  • Scientific Name: Incarvillea
  • Sun: Full sun, partial shade, dappled sunlight
  • Water: Keep soil slightly moist
  • Size: 1.5-2 feet (45-60 centimeters)
  • Lowest Temperature: -15°F (-26.1°C)
  • Toxicity: None
  • Colors: Pink

8. Inch Plant

inch plant

  • Scientific Name: Tradescantia zebrina
  • Sun: Full sun, partial shade
  • Water: Keep soil moist, reduced watering in winter
  • Size: 6-9 inches (15-22 centimeters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Purple, lavender, white

9. Indian Blanket

indian blanket

  • Scientific Name: Gaillardia pulchella
  • Sun: Full sun, partial shade
  • Water: Keep soil slightly dry
  • Size: 1.5-2 feet (45-60 centimeters)
  • Lowest Temperature: 2a  -50°F (-45.5°C)
  • Toxicity: None
  • Colors: Red, burgundy, orange, yellow, gold, purple, lavender, brown, copper

10. Indian Paintbrush

indian paintbrush

  • Scientific Name: Castilleja coccinea
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: 0.5-2 feet (15-60 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Pink, red, yellow, gold, white

11. Indian Pink

indian pink

  • Scientific Name: Lobelia cardinalis
  • Sun: Full sun, partial shade
  • Water: Keep soil moist, occasionally wet
  • Size: 4-5 feet (1-1.5 meters)
  • Lowest Temperature: -35°F (-37.2°C)
  • Toxicity: Medium, only if eaten in large quantities
  • Colors: Pink, red, burgundy, white

12. Indian Shot

indian shot

  • Scientific Name: Canna indica
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 1.5-8 feet (0.3-2.5 meters)
  • Lowest Temperature: 15°F (-9.4°C)
  • Toxicity: None
  • Colors: Red, burgundy, orange, yellow, gold

13. Indigo Plant

indigo plant

  • Scientific Name: Indigofera incarnata
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, allow to dry between waterings
  • Size: 1-2.5 feet (30-76 centimeters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: None
  • Colors: Pink, purple, lavender

14. Inula

inula

  • Scientific Name: Inula helenium
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: 2-6 feet (0.6-1.8 meters)
  • Lowest Temperature: -35°F (-37.2°C)
  • Toxicity: Low
  • Colors: Yellow, gold

15. Ipheion uniflorum (Springstar)

ipheion uniflorum

  • Scientific Name: Ipheion uniflorum
  • Sun: Full sun, partial shade
  • Water: Keep soil slightly moist
  • Size: 3-16 inches (7-40 centimeters)
  • Lowest Temperature: -5°F (-20.5°C)
  • Toxicity: None
  • Colors: Blue, purple, lavender, white

16. Ipomoea (Morning Glory)

ipomoea

  • Scientific Name: Ipomoea
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: Vines reaching up to 15 feet (4.5 meters)
  • Lowest Temperature: -50°F (-45.5°C)
  • Toxicity: Low
  • Colors: Pink, blue, purple, lavender, white

17. Ipomopsis (Standing Cypress)

ipomopsis

  • Scientific Name: Ipomopsis rubra
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil slightly moist
  • Size: 3-6 feet (0.91-1.8 meters)
  • Lowest Temperature: -5°F (-20.5°C)
  • Toxicity: None
  • Colors: Red, burgundy

18. Iris

iris

  • Scientific Name: Iris
  • Sun: Full sun
  • Water: Drought tolerant, allow to dry between waterings
  • Size: Up to 3 feet (91 centimeters), depending on variety
  • Lowest Temperature: -35°F (-37.2°C), depending on variety
  • Toxicity: Low
  • Colors: Pink, red, burgundy, orange, yellow, gold, blue, purple, lavender, white, black

19. Ironweed (Little Ironweed)

ironweed

  • Scientific Name: Cyanthillium cinereum
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: Up to 1 foot (30 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Purple, white

20. Isatis

isatis

  • Scientific Name: Isatis tinctoria
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: 2-4 feet (60-121 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Yellow

21. Isoplexis

isoplexis

  • Scientific Name: Isoplexis canariensis or Digitalis purpurea. Both plants are incredibly similar. Some sources identify them as separate plants while others consider them to be the same.
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 2-5 feet (0.6-1.5 meters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: Highly toxic; consuming any part of the plant can be fatal
  • Colors: Pink, purple, lavender, cream, tan, white

22. Italian Aster

italian aster

  • Scientific Name: Aster amellus
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: 1-2 feet (30-60 centimeters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Yellow, blue, purple, lavender

23. Ivy

ivy

  • Scientific Name: Hedera helix
  • Sun: Full sun, partial shade, dappled sunlight, deep shade
  • Water: Keep soil moist, occasionally wet
  • Size: Vines reaching up to 80 feet (24 meters)
  • Lowest Temperature: -25°F (-31.6°C)
  • Toxicity: Medium; some varieties cause skin irritation
  • Colors: Yellow, gold, green

24. Ivyleaf Geranium

ivyleaf geranium

  • Scientific Name: Pelargonium peltatum
  • Sun: Partial shade
  • Water: Keep soil moist
  • Size: 1-2.5 feet (30-76 centimeters)
  • Lowest Temperature:
  • Toxicity: Low; minor skin irritation; poisonous to cats
  • Colors: Pink, yellow, gold, white

25. Ixia

ixia

  • Scientific Name: Ixia
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 10-20 inches (25-50 centimeters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Pink, red, burgundy, yellow, gold, purple, lavender, cream, tan, white

26. Ixiolirion tataricum (Siberian Lily)

ixiolirion tataricum

  • Scientific Name: Ixiolirion tataricum
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 12-16 inches (30-40 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Purple, lavender

27. Ixora

ixora

  • Scientific Name: Ixora coccinea
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: Up to 3 feet (91 centimeters)
  • Lowest Temperature: 35°F (1.6°C)
  • Toxicity: None
  • Colors: Pink, red, burgundy, orange, yellow, gold