20 Beautiful Flowers that Start with Letter O (Pictures)

Discover the captivating world of flora as we explore 20 beautiful flowers that start with the letter ‘O’. Ranging from enchanting Oenothera biennis to Origanum vulgare these blooms showcase the incredible diversity and charm of the plant kingdom. Join us on this colorful journey and get inspired to bring a touch of magic to your garden, patio, or windowsill with these stunning blossoms.

Oenothera biennis

Oenothera biennis
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  • Common Name: Common Evening Primrose
  • Flowering Periods: Summer, Biennial
  • Water: Medium
  • Soil PH: 5.5-7.0
  • Flower Color: Yellow
  • Special Characteristics: Fragrant flowers, attracts pollinators
  • Hardiness Zone(s): 4-8
  • Sun: Full sun

The Common Evening Primrose is known for its bright yellow, fragrant flowers that bloom during the evening hours. These biennial plants are popular for their various medicinal uses and are a great addition to any garden as they attract pollinators, such as bees and butterflies, providing a valuable food source for local wildlife.

 

Oenothera caespitosa

Oenothera caespitosa
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  • Common Name: Tufted Evening Primrose
  • Flowering Periods: Spring, Summer, Perennial
  • Water: Dry to medium
  • Soil PH: 6.0-8.0
  • Flower Color: White
  • Special Characteristics: Drought-tolerant, night-blooming
  • Hardiness Zone(s): 4-8
  • Sun: Full sun

The Tufted Evening Primrose is a plant with large, white, night-blooming flowers that are known to attract night-flying pollinators such as moths. This drought-tolerant plant is perfect for xeriscaping or low-water gardens, as it thrives in dry conditions and well-drained soils, making it a low-maintenance choice.

 

Oenothera speciosa

Oenothera speciosa
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  • Common Name: Showy Evening Primrose
  • Flowering Periods: Spring, Summer, Perennial
  • Water: Medium
  • Soil PH: 5.5-7.0
  • Flower Color: Pink, White
  • Special Characteristics: Fast-spreading, attracts pollinators
  • Hardiness Zone(s): 4-9
  • Sun: Full sun to part shade

The Showy Evening Primrose is a perennial plant that features delicate, pink or white flowers, creating a striking display in any garden. This plant is fast-spreading and can be used as a ground cover or to fill in empty spaces.

 

Olearia axillaris

Olearia axillaris
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  • Common Name: Coastal Daisy Bush
  • Flowering Periods: Spring, Summer, Evergreen Shrub
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: Yellow
  • Special Characteristics: Salt-tolerant, fragrant flowers
  • Hardiness Zone(s): 9-11
  • Sun: Full sun

The Coastal Daisy Bush is featuring small, white, fragrant flowers that resemble daisies. It is a salt-tolerant plant, making it ideal for coastal gardens and landscapes. The attractive foliage and flowers provide a charming addition to any garden, while the pleasant fragrance adds an extra sensory element.

 

Olearia traversiorum

Olearia traversiorum
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  • Common Name: Chatham Island Daisy Bush
  • Flowering Periods: Spring, Summer, Evergreen Shrub
  • Water: Medium
  • Soil PH: 6.1-7.5
  • Flower Color: White
  • Special Characteristics: Endemic to Chatham Islands, New Zealand
  • Hardiness Zone(s): 8-10
  • Sun: Full sun to part shade

The Chatham Island Daisy Bush is a rare evergreen shrub native to the Chatham Islands in New Zealand. Its white daisy-like flowers bloom in spring and summer, adding charm and beauty to any garden. The plant is a great addition for those seeking a unique, exotic shrub with a touch of natural history.

 

Olearia virgata

Olearia virgata
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  • Common Name: Twiggy Daisy Bush
  • Flowering Periods: Spring, Summer, Evergreen Shrub
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: White
  • Special Characteristics: Attracts pollinators, fine-textured foliage
  • Hardiness Zone(s): 8-10
  • Sun: Full sun

The Twiggy Daisy Bush is an evergreen shrub that showcases small, white daisy-like flowers and fine-textured foliage, making it an excellent choice for adding visual interest to any garden. It blooms in spring and summer, attracting bees and butterflies to its nectar-rich flowers, thus supporting local pollinators and benefiting the ecosystem.

 

Olearia nummularifolia

Olearia nummularifolia flower
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  • Common Name: Pittosporum-leaved Daisy Bush
  • Flowering Periods: Spring, Summer, Evergreen Shrub
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: White
  • Special Characteristics: Glossy foliage, salt-tolerant
  • Hardiness Zone(s): 8-10
  • Sun: Full sun

The Pittosporum-leaved Daisy Bush is an evergreen shrub known for its glossy, green leaves and clusters of small, white flowers that bloom in spring and summer. It’s salt-tolerant and ideal for coastal gardens, providing an attractive and hardy addition to any landscape. Its charming appearance and low-maintenance nature make it a popular choice for gardeners.

 

Oldenlandia corymbosa

Oldenlandia corymbosa
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  • Common Name: Flat-top Mille Graines
  • Flowering Periods: Spring, Summer, Annual
  • Water: Medium to wet
  • Soil PH: 6.1-7.8
  • Flower Color: White
  • Special Characteristics: Medicinal uses, wetland plant
  • Hardiness Zone(s): 9-11
  • Sun: Full sun to part shade

Flat-top Mille Graines is an annual flowering plant that thrives in wetland environments. It produces clusters of small, white flowers in spring and summer, making it a great choice for water gardens or boggy areas. Known for its traditional medicinal uses in some cultures, this plant is both visually appealing and historically significant.

 

Oldenlandia uniflora

Oldenlandia uniflora
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  • Common Name: Clustered Mille Graines
  • Flowering Periods: Spring, Summer, Annual
  • Water: Medium to wet
  • Soil PH: 6.1-7.8
  • Flower Color: White
  • Special Characteristics: Medicinal uses, wetland plant
  • Hardiness Zone(s): 9-11
  • Sun: Full sun to part shade

Clustered Mille Graines enjoys moist environments. It produces small, white flowers in spring and summer, making it a suitable choice for water gardens or boggy areas. Known for its medicinal applications in some cultures, this plant offers both visual appeal and historical interest, providing a distinctive touch to your garden.

 

Onobrychis viciifolia

Onobrychis viciifolia
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  • Common Name: Common Sainfoin
  • Flowering Periods: Summer, Perennial
  • Water: Dry to medium
  • Soil PH: 6.0-7.5
  • Flower Color: Pink
  • Special Characteristics: Nitrogen-fixing, forage crop
  • Hardiness Zone(s): 4-8
  • Sun: Full sun

Common Sainfoin produces pink blooms in the summer. It is a nitrogen-fixing plant and is often used as a forage crop for livestock due to its high nutritional content. Its drought-tolerant nature and ability to improve soil fertility make it a valuable addition to any garden, particularly those focused on sustainability and ecological balance.

 

Ononis repens

Ononis repens
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  • Common Name: Common Restharrow
  • Flowering Periods: Summer, Perennial
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: Pink
  • Special Characteristics: Medicinal uses, attracts pollinators
  • Hardiness Zone(s): 4-8
  • Sun: Full sun to part shade

Common Restharrow is a perennial flowering plant that boasts lovely pink flowers during the summer months. Known for its traditional medicinal uses, this plant is also a great choice for attracting pollinators such as bees and butterflies.

 

Onopordum acanthium

Onopordum acanthium
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  • Common Name: Cotton Thistle
  • Flowering Periods: Summer, Biennial
  • Water: Dry to medium
  • Soil PH: 6.0-7.5
  • Flower Color: Purple
  • Special Characteristics: Attracts pollinators, architectural plant
  • Hardiness Zone(s): 5-9
  • Sun: Full sun

Cotton Thistle is a biennial plant known for its impressive height and large, architectural form. Its striking purple flowers bloom in summer and attract pollinators such as bees and butterflies. This thistle is a great choice for adding structure and visual interest to your garden.

 

Onosma tauricum

Onosma tauricum

  • Common Name: Tauric Golden Drop
  • Flowering Periods: Spring, Summer, Perennial
  • Water: Dry to medium
  • Soil PH: 6.0-7.5
  • Flower Color: Yellow
  • Special Characteristics: Drought-tolerant, rock gardens
  • Hardiness Zone(s): 5-9
  • Sun: Full sun

Tauric Golden Drop is known for its bright yellow, droplet-shaped flowers that bloom in spring and summer. Its drought-tolerant nature and preference for well-drained soils make it an ideal candidate for rock gardens and xeriscaping. The vibrant color and unique flower shape add visual appeal and interest to any garden.

 

Ophrys apifera

Ophrys apifera
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  • Common Name: Bee Orchid
  • Flowering Periods: Spring, Perennial
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: Pink, brown, and white
  • Special Characteristics: Mimics the appearance of bees, terrestrial orchid
  • Hardiness Zone(s): 7-9
  • Sun: Full sun to part shade

The Bee Orchid features unique flowers resembling bees, with a combination of pink, brown, and white colors. This terrestrial orchid blooms in spring and thrives in well-drained soils. Its intriguing appearance and adaptability make it a captivating addition to any garden, sure to delight visitors and garden enthusiasts alike.

 

Ophrys insectifera

Ophrys insectifera
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  • Common Name: Fly Orchid
  • Flowering Periods: Spring, Perennial
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: Brown, green, and white
  • Special Characteristics: Mimics the appearance of flies, terrestrial orchid
  • Hardiness Zone(s): 6-9
  • Sun: Part shade

The Fly Orchid is a remarkable perennial terrestrial orchid that features flowers resembling flies in brown, green, and white hues. Blooming in spring, this orchid prefers well-drained soils and part shade. The Fly Orchid’s unique appearance and intriguing insect mimicry make it an alluring choice for those looking to add a touch of the unusual to their gardens.

 

Ophrys sphegodes

Ophrys sphegodes
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  • Common Name: Early Spider Orchid
  • Flowering Periods: Spring, Perennial
  • Water: Medium
  • Soil PH: 6.0-7.5
  • Flower Color: Brown and green
  • Special Characteristics: Mimics the appearance of spiders, terrestrial orchid
  • Hardiness Zone(s): 7-9
  • Sun: Part shade

The Early Spider Orchid is known for its flowers that mimic the appearance of spiders. It blooms in spring, displaying intriguing brown and green colors. Preferring well-drained soils and part shade.

 

Opuntia humifusa

Opuntia humifusa
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  • Common Name: Eastern Prickly Pear
  • Flowering Periods: Summer, Perennial, Cactus
  • Water: Dry
  • Soil PH: 6.0-7.5
  • Flower Color: Yellow
  • Special Characteristics: Drought-tolerant, edible fruit
  • Hardiness Zone(s): 5-10
  • Sun: Full sun

Eastern Prickly Pear produces vibrant yellow flowers in the summer. Known for its drought-tolerant nature, it thrives in arid environments and full sun. The plant produces edible fruit, adding both visual appeal and practical use to your garden. Its distinctive appearance creates a focal point in any xeriscape or desert-themed landscape.

 

Opuntia ficus-indica

Opuntia ficus-indica
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  • Common Name: Indian Fig
  • Scientific Name: Opuntia ficus-indica
  • Flowering Periods: Summer, Perennial, Cactus
  • Water: Dry
  • Soil PH: 6.1-7.8
  • Flower Color: Yellow
  • Special Characteristics: Drought-tolerant, edible fruit, culinary uses
  • Hardiness Zone(s): 9-11
  • Sun: Full sun

Indian Fig is known for its edible fruit, it is often used in culinary dishes. This drought-tolerant plant is perfect for dry landscapes or xeriscaping, adding a unique touch to your garden. The Indian Fig’s combination of beauty and practicality make it an appealing choice for those in arid climates.

 

Opuntia polyacantha

Opuntia polyacantha
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  • Common Name: Plains Prickly Pear
  • Scientific Name: Opuntia polyacantha
  • Flowering Periods: Summer, Perennial, Cactus
  • Water: Dry
  • Soil PH: 6.0-7.5
  • Flower Color: Yellow
  • Special Characteristics: Drought-tolerant, low-growing
  • Hardiness Zone(s): 4-9
  • Sun: Full sun

Plains Prickly Pear is a low-growing perennial cactus that showcases beautiful yellow flowers in the summer. This drought-tolerant plant thrives in full sun and dry conditions, making it an ideal candidate for xeriscaping or desert-themed gardens. Its low growth habit and vivid flowers add visual interest to any arid landscape, while its hardiness ensures it will endure in a variety of climates.

 

Origanum vulgare

Origanum vulgare
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  • Common Name: Common Oregano
  • Scientific Name: Origanum vulgare
  • Flowering Periods: Summer, Perennial, Shrub
  • Water: Dry to medium
  • Soil PH: 6.0-8.5
  • Flower Color: Purple
  • Special Characteristics: Culinary and medicinal uses
  • Hardiness Zone(s): 5-9
  • Sun: Full sun

Common Oregano is a versatile perennial shrub that produces purple flowers in the summer. Popular for its culinary and medicinal applications, this plant is also a magnet for pollinators such as bees and butterflies. Thriving in full sun and well-drained soils, Common Oregano adds both practicality and beauty to any garden, making it a popular choice for herb gardens and landscape designs alike.

 

Summary

These 20 O-flowering plants present a diverse and captivating selection of botanical wonders that can bring beauty, functionality, and ecological benefits to any garden.

By incorporating these plants into your landscape, you can create a stunning visual display while also supporting local pollinators and improving your garden’s overall health.

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