These are the different breeds of flowers with name and image for you to view. This is a list of flower names that begin with the letter O. Emphasis is placed on common and easy to grow kinds.

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Common Flower Names Beginning With O.

Obedient Plant

Physostegia virginiana, the obedient plant, obedience or false dragonhead got its name because you can bend the individual flowers in any direction

Obedient plant (Physostegia virginiana)

Obovate Peony

10 Flowers That Start With O 2

This plant has white to purple-red flowers and its lower leaves consist of no more than nine leaflets or segments. 

Obovate peony (Paeonia obovata)

Ohio Spiderwort

Ohio spiderwort (Tradescantia ohiensis)

Old Lady Cactus

In the spring or summer, this cactus sprouts red or purple flower around the top.

Old Lady Cactus (Mammillaria Hahniana)

Old Man of the Andes

Old Man of the Andes (Oreocereus Celsianus)

Oleander Plant

Nerium oleander, usually referred to as oleander, is an upright, rounded evergreen sub-tropical to tropical shrub produces purple, pink or white five-petaled funnel-shaped flowers during the summer to fall months.

Oleander Plant (Nerium Oleander)

Orchid

Orchids occur in every habitat/terrain on the planet, except for Antarctica and true deserts.

Orchid. (Orchidaceae).

Oregon Grape

This plant sprouts thick bunches of yellow flowers in early spring, succeeded by dark bluish-black berries. In 1899 Oregon adopted the Oregon Grape (Berberis aquifolium) as the Official State Flower.

Oregon Grape (Mahonia)

Oriental Lily

Lilium ‘Stargazer’ is a hybrid lily of the ‘Oriental group’. Oriental lilies are known for their fragrant perfume, blooming mid-to-late summer. Stargazers are easy to grow and do best in full sunlight. 

Oriental Lily. (Stargazer).

Oriental Poppy

Oriental Poppy. (Papaver).

Ornamental Onion

Wild onions have flat leaves while wild garlic has round leaves.

Ornamental Onion. (Allium).

Osteospermum

Osteospermum. (Calendula Family, Cape Daisy).

Oyster Plant

It also goes by the names bear’s breeches, sea dock, bearsfoot, and it is considered to be an invasive species in some regions.

Oyster Plant. (Acanthus mollis).

Ox Eye Daisy

Leucanthemum vulgare (Ox-eye Daisy, oxeye daisydog daisy) is generally cultivated and ready as a perennial flowering ornamental plant for gardens.

Ox Eye Daisy. (Leucanthemum vulgare).