Flowers that start with O are botanical beauties in their own right! These flowers are true standouts in every garden With enchanting colors, shapes, and meanings. They may not be as popular as sunflowers or roses, but they can also be showstoppers in the world of blooms!
List of Flowers That Start With O
1. Obedient Plant (Physostegia virginiana)
Can you think of a more acquiescent flower than one called an “obedient” plant? This entry is unique because the flowers can be bent and manipulated to stay in place. A native perennial plant to the eastern half of North America, it’s a member of the mint family (Lamiaceae) and grows in clusters of pink or lavender flowers.
True to its name, this flower symbolizes obedience, flexibility, and adaptability.
2. Oleander (Nerium oleander)
Perhaps one of the most beautiful flowers that start with O, oleander is a widely used landscape plant native to the Mediterranean region. Its gorgeous flowers come in colors like pink, coral, purple, red, white, and yellow, some of which are also fragrant. But be warned—this plant is highly toxic and demands special care before being added to your garden or yard.
Because of their toxicity, the flowers symbolize caution and the need to tread carefully. Interestingly, they’re also associated with everlasting love and passion, particularly the red-colored type.
3. Osbeckia (Osbeckia spp.)
Osbeckia is a native of Asia and Australia and is renowned for its strikingly purple or magenta petals and yellow stamens. It thrives in humid climates and can be seen growing in the wild, particularly in forested or hilly areas.
There isn’t any particular symbolism attached to this flower. However, since it flourishes in rugged environments, it may symbolize resilience and finding nature’s beauty in unexpected places.
4. Opium Poppy (Papaver somniferum)
This flower has dramatic, almost paper-y-looking flowers that come in white, red, and pink shades. Native to Turkey, this annual plant is cultivated for various uses, from medicinal to ornamental.
Opium, a type of depressant drug, is derived from the opium poppy. Hence, this plant is heavily associated with sleep, even death.
5. Opuntia (Opuntia spp.)
Widely known as the “prickly pear cactus,” Opuntia has large, showy flowers in orange, pink, or yellow. This species grows in hot and dry climates, such as deserts, roadsides, and dunes. It provides food for livestock in these areas, becoming a valuable resource.
Native to the Americas, this plant—along with cacti in general—has come to symbolize endurance, strength, and the ability to thrive even in arid conditions.
6. Orange Blossoms (Citrus sinensis)
Native to Asia, orange blossoms appear as small, tightly closed white blossoms with five petals on orange trees. They smell amazing, with sweet citrusy notes and floral undertones. Orange blossoms have many uses and are popular for making perfumes, essential oils, and even culinary dishes.
With their delicate appearance and sweet fragrance, these flowers are often associated with purity and beauty, even fertility and good fortune.
7. Orchid (Orchidaceae family)
Orchids come to mind when people think of flowers that start with O - and for good reason! The Orchidaceae family is massive and includes thousands of attractively flowering plant species that can be found all over the world, particularly in the wet tropics. The most popular types include Cattleya, moth orchids, and slipper orchids.
These flowers have long been associated with romance and love but can also symbolize elegance, strength, and luxury across different cultures.
8. Oregano (Origanun vulgare)
Although well-known as a culinary herb, oregano produces small pink or pale purple flowers that can also be used as a garnish in various dishes.
Oregano’s name translates to “joy of the mountain” and is credited as the goddess Aphrodite’s creation. Thus, this herb is associated with joy, happiness, and good luck.
9. Oregon Grape (Mahonia aquifolium)
No, this evergreen shrub doesn’t produce grapes, despite its name! It bears lightly scented yellow flowers, which eventually develop into sour blue-black berries (that resemble grapes) by early fall.
Officially recognized as Oregon’s state flower, the shrub's flowers symbolize creation’s natural beauty and connection with nature.
10. Ornamental Onion (Allium spp.)
Ornamental onions belong to the onion family and bring color to many perennial gardens with gorgeous ball-shaped blooms. Native to the Northern Hemisphere, these blooms feature clusters of star-shaped flowers in shades of yellow, blue, pink, purple, and white.
People associate these flowers with prosperity, beauty, and good fortune.
11. Ornithogalum (Ornithogalum spp.)
Popularly known as the “Star of Bethlehem,” “Snake Flower,” or “Orange Star Flower,” ornithogalum is a member of the Hyacinth family native to the Mediterranean region. It’s well-known for its delicate yellow or white flowers, which can make amazing additions to any home garden.
Most associate the Ornigalthum, as the Star of Bethlehem, with the birth of Jesus Christ and his many traits, including forgiveness, hope, purity, and innocence.
12. Oriental Poppies (Papaver orientale)
Native to Central Asia, Oriental Poppies are perennial plants with cup-shaped flowers in eye-catching pink, orange, and red shades, often with a dark-colored center. They typically bloom in late spring to early summer.
People often associate this flower—and poppies in general—with death, peace, and remembrance, similar to opium poppies. However, in other cultures, Oriental Poppies can also symbolize luxury and extravagance.
13. Osteospermum (Osteospermum spp.)
Also called the African daisy or the Cape, osteospermum are perennial plants that come in white, purple, pink, or orange, often with a bright blue-purple center. They bloom from spring to fall, and gardeners usually plant them alone or alongside other flowers like pansies.
Depending on the culture, osteospermum can symbolize purity, innocence, happiness, and new beginnings.
14. Oxalis (Oxalis spp.)
The oxalis plant has clover-like leaves, so people often label it a “shamrock plant,” but it isn’t related to clovers. It produces white, yellow, lavender, and rose-colored flowers, though some come in two-toned forms. People also call it a “wood sorrel.”
Perhaps because of its association with shamrocks and four-leaf clovers, the oxalis has also come to symbolize good luck and happiness.
15. Oxeye Daisy (Leucanthemum vulgare)
The last entry in our list of flowers that start with O is the oxeye daisy, a native plant to Europe and Asia. Also called field daisy, dog daisy, or marguerite, the flowers have simple white petals surrounding a bright yellow center. They are a common sight in wildflower fields and roads.
Oxeye daisies can symbolize innocence, purity, loyalty, and patience.
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