25 Beautiful Flowers That Start With R

Are you looking for flowers that start with R? You've come to the right place. We have a list of flowers that range from tiny to tall, dainty to sturdy, and are full of colors. Keep reading to learn more about these flowers.

Quick Look

25 Beautiful Flowers That Start With R

1. Rain Lily

rain lily

  • Scientific Name: Habranthus
  • Sun: Full sun, partial shade
  • Water: Keep soil moist and occasionally wet
  • Size: Up to 12 inches (30 centimeters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: Low, can be fatal if eaten
  • Colors: Pink, red, burgundy, yellow, gold, brown, copper, white

Rain lily bulbs can be stored through winter to be planted again next year. The Habranthus rain lily shouldn’t be confused with the Zephyranthes rain lily.

2. Rampion Bellflower

rampion bellflower

  • Scientific Name: Campanula rapunculoides
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 2-4 feet (60-121 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Blue, purple, lavender

Although the rampion bellflower looks delicate, it’s labeled as a noxious weed in some places and isn’t recommended for flowerbeds since it can become weedy.

3. Ranunculus (Buttercup)

ranunculus

  • Scientific Name: Ranunculus
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: Up to 2 feet (60 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: Medium, can cause skin irritation and severe symptoms if eaten
  • Colors: Pink, red, burgundy, orange, yellow, gold, green, white

Ranunculus is most often yellow, but several other warm colors are available. They’re an early-blooming variety that will show up in April.

4. Rattlesnake Master

rattlesnake master

  • Scientific Name: Eryngium yuccifolium
  • Sun: Full sun
  • Water: Drought tolerant, keep soil moist
  • Size: 4-5 feet (1-1.5 meters)
  • Lowest Temperature: -10°F (-23.3°C)
  • Toxicity: None
  • Colors: Green, blue, white

The rattlesnake master was once used to treat rattlesnake bites, which is how it got its name. It’s a self-seeding flower that will come back year after year.

5. Red Campion

red campion

  • Scientific Name: Silene dioica
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil moist
  • Size: 12-18 inches (30-45 centimeters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Pink

Although red campion is happiest with water and partial shade, it can endure full sun and some drought, making it a durable addition to the garden.

6. Red Hot Poker

red hot poker

  • Scientific Name: Kniphofia 
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 3-4 feet (0.91-1 meters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Red, burgundy, orange, yellow, gold

The red hot poker grows bright spikes that will surely become a focal point in any landscape.

7. Red Torch Cactus

red torch cactus

  • Scientific Name: Echinopsis huascha
  • Sun: Full sun
  • Water: Allow soil to dry between waterings
  • Size: 2.5-5 feet (0.8-1.6 meters)
  • Lowest Temperature: 20°F (-6°C)
  • Toxicity: None
  • Colors: Pink, red, orange, yellow

The red torch cactus grows bright flowers that are typically red, but they can be other warm colors, too. If you can’t grow it outdoors, you can grow them inside.

8. Red Twig Dogwood

red twig dogwood

  • Scientific Name: Cornus sericea
  • Sun: Full sun, partial shade
  • Water: Keep soil moist, tolerant of dry and wet soils
  • Size: 5-9 feet (1.5-2.7 meters)
  • Lowest Temperature: -50°F (-45.5°C)
  • Toxicity: None
  • Colors: Yellow, gold, green, white, cream, tan

This shrub grows clusters of tiny flowers that attract several pollinators. This plant is also loved for its bright red stems.

9. Red Valerian

red valerian

  • Scientific Name: Valeriana rubra, Centranthus ruber
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil moist
  • Size: 1.5-3 feet (45-91 centimeters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Pink, red, burgundy, yellow, gold, purple, lavender, white

The clusters of tiny flowers on the red valerian are appealing to butterflies and other pollinators. This self-seeding flower can be invasive, so deadhead the spent blooms to prevent them from dropping seeds.

10. Redvein Enkianthus

redvein enkianthus

  • Scientific Name: Enkianthus campanulatus
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: 6-16 feet (1.8-4.8 meters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Pink, yellow, gold, white, cream, tan

This small tree grows beautiful bell-shaped flowers. It has similar soil needs to the Rhododendron, so they’re good companions to plant together.

11. Regal Geranium

regal geranium

  • Scientific Name: Pelargonium x domesticum
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil moist
  • Size: 1-3 feet (30-91 centimeters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None
  • Colors: Pink, red, purple, lavender

Regal geraniums thrive in warmer climates, but they can be grown as annuals in cooler climates. 

12. Reticulated Iris

reticulated iris

  • Scientific Name: Iris reticulata
  • Sun: Full sun, partial shade
  • Water: Keep soil moist during growing season, dry in the summer
  • Size: 4-6 inches (10-15 centimeters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: Low
  • Colors: Yellow, blue, purple, lavender, white

The reticulated iris is a dwarf iris variety that comes in beautiful shades of blue and purple.

13. Rhododendron

rhododendron

  • Scientific Name: Rhododendron
  • Sun: Dappled sunlight, full shade
  • Water: Kep soil moist
  • Size: 3-6 feet (0.91-1.8 meters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: High
  • Colors: Pink, white

Rhododendron is a large genus of up to 900 different species of shrubs that includes azaleas, so there's often confusion between the two.

14. Robin's Plantain

robin's plantain

  • Scientific Name: Erigeron pulchellus
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil moist
  • Size: 6-20 inches (15-50 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Pink, purple, lavender, white

Robin’s plantains are small flowers that prefer to grow in nutrient-deficient soils, making them the perfect choice for the neglected corner of your garden.

15. Rock Cross

rock cross

  • Scientific Name: Arabis caucasica
  • Sun: Full sun
  • Water: Drought tolerant, keep soil moist
  • Size: 6-12 inches (15-30 centimeters)
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: White

Rock cross is another small, hardy flower that you can pay little attention to. While it prefers moist soil, it can happily grow in dry conditions and even tolerate poor soils.

16. Rock Rose

rock rose

  • Scientific Name: Cistus x hybridus, Cistus x cobariensis
  • Sun: Full sun
  • Water: Drought tolerant, keep soil moist
  • Size: 2-5 feet (0.6-1.5 meters)
  • Lowest Temperature: 0°F (-17.7°C)
  • Toxicity: None
  • Colors: Yellow, white

Rock Rose is an evergreen shrub that grows small flowers. Once the flowers die at the end of the growing season, you can still enjoy the foliage through winter.

17. Rocktrumpet

rocktrumpet

  • Scientific Name: Mandevilla
  • Sun: Full sun, partial shade
  • Water: Keep soil moist
  • Size: Vines up to 12 feet (3.6 feet)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: Low, mild symptoms if consumed
  • Colors: Pink, red, yellow

Rocktrumpet, or Mandevilla, is native to a hot and humid climate, but it can be grown as an annual in cooler areas. You can bring your plant indoors over winter if you want to keep it as a perennial.

18. Rocky Mountain Iris

rocky mountain iris

  • Scientific Name: Iris missouriensis
  • Sun: Full sun, partial shade
  • Water: Keep soil moist or wet
  • Size: 1-2 feet (30-60 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Yellow, blue, purple, lavender, white

The Rocky Mountain iris prefers wet soils and full sun, so it will work well in low spots in your flower beds.

19. Rodgersia

rodgersia

  • Scientific Name: Rodgersia aesculifolia
  • Sun: Full sun, partial shade
  • Water: Keep soil moist or wet
  • Size: 3-5 feet (0.91-1.5 meters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Pink, white, cream, tan

Rodgersia requires plenty of moisture, so it’s best suited for areas of the garden that is easy to water or collects runoff water. If you have a pond or stream, that would be an ideal location.

20. Rondeletia

rondeletia

  • Scientific Name: Rondeletia
  • Sun: Full sun, partial shade
  • Water: Keep soil moist in growing season
  • Size: Up to 16 feet (5 meters)
  • Lowest Temperature: 30°F (-1.1°C)
  • Toxicity: None
  • Colors: Pink, red, orange, yellow, purple

Rondeletia is a large shrub that can be pruned to be a privacy hedge. It’s native to the hot climates of Australia, so it may be difficult to grow in the northern hemisphere.

21. Rose

rose

  • Scientific Name: Rosa
  • Sun: Full sun
  • Water: Keep soil moist
  • Size: Up to 20 feet (6 meters) depending on variety
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Pink, red, burgundy, orange, yellow, gold, purple, lavender, white, cream, tan, variegated

Roses grow on bushes that have spiky thorns, so be careful if you have children or pets that like to hide in bushes. 

22. Rose Mallow

rose mallow

  • Scientific Name: Hibiscus moscheutos
  • Sun: Full sun, partial shade
  • Water: Keep soil moist or wet
  • Size: 4-7 feet (1-2.1 meters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: No
  • Colors: Pink, red, burgundy, white

Rose mallow is a cool-tolerant Hibiscus variety. It grows well in wet soils and can tolerate salty conditions.

23. Rosinweed Sunflower

rosinweed sunflower

  • Scientific Name: Helianthus silphioides
  • Sun: Full sun
  • Water: Drought tolerant, keep soil moist
  • Size: 3-10 feet (0.91-3 meters)
  • Lowest Temperature: -20°F (-28°C)
  • Toxicity: None
  • Colors: Red, yellow, purple

This sunflower is sometimes called the Ozark sunflower. It’s typically yellow but it can sometimes have a reddish-purple center.

24. Roundleaf Liverleaf

roundleaf liverleaf

  • Scientific Name: Hepatica americana, Anemone americana
  • Sun: Partial shade, dappled sunlight
  • Water: Drought tolerant, keep soil moist
  • Size: 6-9 inches (15-22 centimeters)
  • Lowest Temperature: -40°F (-40°C)
  • Toxicity: None
  • Colors: Pink, blue, purple, lavender, white

The roundleaf liverleaf is one of the first flowers to bloom in the spring, making it important for pollinators.

25. Rudbeckia

rudbeckia

  • Scientific Name: Rudbeckia
  • Sun: Full sun, partial shade
  • Water: Drought tolerant, keep soil moist when young
  • Size: Up to 3 feet (91 centimeters) depending on variety
  • Lowest Temperature: -30°F (-34°C)
  • Toxicity: None
  • Colors: Pink, red, orange, yellow, purple, brown

The Rudbeckia family of flowers may be better known as the coneflowers.