25 Flowers That Start With The Letter X

You'll find many interesting flowers that start with X to add to your garden. Some of them are hard to find in stores, so you may have to do some digging.

We have a list of flowers and flowering shrubs, and trees that start with X with crucial information so you can find something that will work in your garden.

Flowers That Start With X

Quick Look

1. x Chirtalpa tashkentensis (Chitalpa)

x chirtalpa tashkentensis

  • Scientific Name: x Chirtalpa tashkentensis
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, performs best with consistently moist soil
  • Size: 20-35 feet (6-10 meters)
  • Lowest Temperature: -10°F (-23.3°C)
  • Toxicity: None
  • Colors: Pink, white

Chitalpa is a fast-growing tree that can withstand drought conditions. However, the flowers will look their best when the tree receives consistent levels of water.

2. x Fatshedera lizei (Tree Ivy)

x fatshedera lizei

  • Scientific Name: x Fatshedera lizei 
  • Sun: Partial shade
  • Water: Keep soil moist
  • Size: 3-5 feet (0.91-1.5 meters)
  • Lowest Temperature: 5°F (-15°C)
  • Toxicity: None
  • Colors: Green, white

This plant is a cross between Japanese fatsia (Fatsia japonica “Moserii”) and common ivy (Hedera helix). It’s a flowering ivy that works well as a groundcover but can be pruned to take on a bushy form.

3. x Gordlinia grandiflora (Mountain Gordlinia)

  • Scientific Name: x Gordlinia grandiflora
  • Sun: Partial shade
  • Water: Keep soil moist
  • Size: 20-30 feet (6-9 meters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: None
  • Colors: White

Mountain Gordlinia is a flowering plant that can be grown as a large shrub or a small tree. Small flowers bloom in summer and early fall. The plant is uncommon, so it’s hard to find in stores.

4. x Gordlinia grandiflora “Sweet Tea” (Mountain Gordlinia)

  • Scientific Name: x Gordlinia grandiflora “Sweet Tea”
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 20-30 feet (6-9 meters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: None
  • Colors: Yellow, gold, white

“Sweet tea” Gordlinia is a cultivar of Mountain Gordlinia that can be found in the southern United States. The cultivar got its name because the flowers have a sweet scent and sweet tea is prominent in the southern states.

5. x Heucherella (Foamy Bells)

x heucherella

  • Scientific Name: x Heucherella
  • Sun: Partial shade, deep, shade
  • Water: Keep soil moist
  • Size: 1-1.5 feet (30-45 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Pink, cream, tan, white

Foamy bells are a cross between coral bells (Heuchera) and foam flowers (Tiarella). Some varieties are evergreen in warm climates.

6. x Petchoa (Petunia)

x petchoa

  • Scientific Name: x Petchoa
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: Up to 12 inches (30 centimeters)
  • Lowest Temperature: -10°F (-23.3°C)
  • Toxicity: None
  • Colors: Pink, red, orange, yellow, blue, purple

x Petchoa is a petunia hybrid that boasts large, beautiful flowers available in various colors. They’re best suited for warm climates where they can receive regular watering.

7. x Rudbeckia (Echibeckia Summerina)

x rudbeckia

  • Scientific Name: x Rudbeckia
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 1.5-2 feet (45-60 centimeters)
  • Lowest Temperature: -10°F (-23.3°C)
  • Toxicity: None
  • Colors: Red, burgundy, yellow, gold, brown, copper

Echibeckia Summerina is an echinacea hybrid. The long-lasting blooms need plenty of water, especially during extreme heat. It works well in containers since it’s a compact plant.

8. x Solidaster luteus (Solidaster)

x solidaster luteus

  • Scientific Name: x Solidaster luteus 
  • Sun: Full sun
  • Water: Keep soil moist or slightly dry
  • Size: 2-2.5 feet (60-76 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Yellow

Solidaster is a hybrid between Solidago and Aster. It grows delicate pale yellow flowers that look fluffy on the plant, making them a gorgeous addition to flower beds.

9. Xanthisma texanum (Texas Sleepy Daisy)

xanthisma texanum

  • Scientific Name: Xanthisma texanum
  • Sun: Partial shade
  • Water: Drought tolerant
  • Size: 1-3 feet (30-91 centimeters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: None
  • Colors: Yellow

The Texas sleepy daisy is in the Aster family. The blooms don’t open until the afternoon.

10. Xanthium strumarium (Cocklebur)

xanthium strumarium

  • Scientific Name: Xanthium strumarium
  • Sun: Full sun, partial shade
  • Water: Keep soil moist, occasional flooding
  • Size: 2-4 feet (60-121 centimeters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: High, may be fatal if eaten
  • Colors: Green, purple, lavender

The cocklebur can be weedy since they grow rapidly and spread their seeds by hooking onto animals or clothing. Seedlings release toxic chemicals that can kill nearby plants.

11. Xanthoceras sorbifolium (Yellowhorn)

xanthoceras sorbifolium

  • Scientific Name: Xanthoceras sorbifolium
  • Sun: Full sun
  • Water: Drought tolerant
  • Size: 8-25 feet (2.4-7 meters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Red, burgundy, orange, yellow, cream, tan, white

The beautiful yellowhorn flowers are edible and taste somewhat like chestnut. The flowers change from green to red as they grow and mature.

12. Xanthorhiza simplicissima (Yellowroot)

xanthorhiza simplicissima

  • Scientific Name: Xanthorhiza simplicissima 
  • Sun: Partial shade, dappled sunlight
  • Water: Keep soil moist
  • Size: 2-3 feet (60-91 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Purple, lavender, brown, copper

Yellowroot is a shrub that is aptly named for its yellow roots. It grows clusters of purple-brown flowers in the spring that droop down from the plant.

13. Xanthosoma atrovirens (Mouse Cup Taro)

xanthosoma atrovirens

Scientific Name: Xanthosoma atrovirens

Sun: Partial shade

Water: Keep soil moist

Size: 2-3 feet (60-91 centimeters)

Lowest Temperature: 10°F (-12°C)

Toxicity: None

Colors: Green, white

The mouse cup taro doesn’t always grow a flower. When it does, it grows a spathe and spadix that looks like the elephant ear’s (Xanthosoma sagittifolium).

14. Xanthosoma sagittifolium (Elephant Ear)

xanthosoma sagittifolium

  • Scientific Name: Xanthosoma sagittifolium
  • Sun: Partial shade, full shade
  • Water: Keep soil moist
  • Size: 2-4 feet (60-121 centimeters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Green, white

The elephant ear is a popular house plant among plant lovers. It can be grown indoors with bright, indirect light or outdoors in a shady spot.

15. Xanthosoma “Lime Zinger” (Elephant Ear)

xanthosoma-“Lime-zinger”

  • Scientific Name: Xanthosoma “Lime Zinger”
  • Sun: Partial shade, full shade
  • Water: Keep soil moist
  • Size: 2-4 feet (60-121 centimeters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Green, white

The Lime Zinger elephant ear is a vibrant green cultivar of Xanthosoma.

16. Xeranthemum (Everlasting Plant)

xeranthemum

  • Scientific Name: Xeranthemum
  • Sun: Full sun
  • Water: Drought tolerant
  • Size: 1-2 feet (30-60 centimeters)
  • Lowest Temperature: -50°F (-45.5°C)
  • Toxicity: None
  • Colors: Pink, purple

Although a beautiful flower, the everlasting plant is often considered a weed because of its rapid growth and easy self-seeding tendencies.

17. Xeranthemum annuum (Everlasting Plant)

xeranthemum annuum

  • Scientific Name: Xeranthemum annuum
  • Sun: Full sun
  • Water: Drought tolerant
  • Size: Up to 2 feet (60 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Pink, purple, white

Xeranthemum annuum is a cultivar of the everlasting plant. The flowers thrive in poor, dry soils.

18. Xeranthemum lumina (Everlasting Plant)

xeranthemum lumina

  • Scientific Name: Xeranthemum lumina
  • Sun: Full sun, partial shade
  • Water: Drought tolerant
  • Size: 24-28 inches (60-70 centimeters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None
  • Colors: Red, purple, white

This is another cultivar of the everlasting plant. This variety prefers warm or hot climates and will tolerate partial shade.

19. Xerochrysum bracteatum (Everlasting Daisy)

xerochrysum bracteatum

  • Scientific Name: Xerochrysum bracteatum
  • Sun: Full sun, partial shade
  • Water: Drought tolerant
  • Size: Up to 5 feet (1.5 meters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Pink, red, burgundy, orange, yellow, gold, white

Everlasting daisies are available in several vibrant colors and are often used in flower arrangements. Pruning spent flowers will encourage new growth and more blooms.

20. Xeronema callistemon (Poor Knights Lily)

xeronema callistemon

  • Scientific Name: Xeronema callistemon
  • Sun: Full sun, partial shade
  • Water: Keep soil
  • Size: 2-3 feet (60-91 centimeters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None
  • Colors: Red

Poor Knights lily is native to Poor Knights and Hen Islands in New Zealand, which is how they got their name.

21. Xerophyllum (Common Beargrass)

xerophyllum

  • Scientific Name: Xerophyllum
  • Sun: Full sun
  • Water: Drought tolerant
  • Size: 3-6 feet (0.91-1.8 meters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: White

Common beargrass doesn’t always bloom in a garden because it typically blooms after a fire in the wild. Still, the foliage is pretty enough to keep in a flower bed as you wait for an uncommon bloom.

22. Xylobium (Orchid)

xylobium

  • Scientific Name: Xylobium
  • Sun: Partial shade
  • Water: Allow soil to dry slightly between waterings
  • Size: Up to 6 feet (1.8 meters)
  • Lowest Temperature: 40°F (4.4°C)
  • Toxicity: None
  • Colors: Purple, cream, white

Xylobium is an uncommon member of the orchid family. It’s native to tropical areas, and you likely won’t see it for sale often.

23. Xylosma (Dense Logwood)

xylosma

  • Scientific Name: Xylosma
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 8-12 feet (2.4-3.6 meters)
  • Lowest Temperature: 10°F (-12°C)
  • Toxicity: None
  • Colors: Cream

The flowers on the dense longwood aren’t showy. They’re cream-colored and don’t last long before berries appear.

24. Xyris difformis (Yellow-Eyed Grass)

xyris difformis

  • Scientific Name: Xyris difformis
  • Sun: Full sun
  • Water: Keep soil moist or wet
  • Size: 0.5-2 feet (15-60 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Yellow

The small yellow flowers of this plant are open in the morning and closed in the afternoon.

25. Xyris torta (Slender Yellow-Eyed Grass)

xyris torta

  • Scientific Name: Xyris torta
  • Sun: Full sun
  • Water: Keep soil moist or wet
  • Size: 0.5-2 feet (15-60 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Yellow, brown

Xyris torta is a cultivar of yellow-eyed grass. Only one or two flowers will bloom at the same time.