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.
To learn more about the various flowers available for your garden, make sure to check out our list of “Flower Names A to Z”.
25 Gorgeous Flowers That Start With X
1. x Chirtalpa tashkentensis (Chitalpa)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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)
- 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.
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