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.
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 Beautiful Flowers That Start With R
1. 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
- 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)
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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.
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