89+ Plants that Start With O letter -

89+ Plants that Start With O letter

Plants that start with O are a diverse group, ranging from delicate orchids to hardy ornamental onions. They come in all shapes and sizes and can be found in a variety of colors.

Some of the most popular plants that start with “O” include evening primrose, sensitive fern, lilyturf, orchid, ornamental onion, sweet osmanthus, shamrock, oyster plant, and orange.

These plants are found all over the world and can be grown in a variety of climates. Some, like the orchid, are more difficult to care for, while others, like the ornamental onion, are relatively easy to grow.

No matter what your gardening experience level, there is sure to be a plant that starts with “O” that is perfect for you. So do some research and find the perfect plant to add to your garden or home today!

Explanation of Plants that Start With O

Oenothera (evening primrose)

Evening primrose is the popular name for a genus of blooming plants called Oenothera. The evening primrose is from North America, Europe, Asia, and Africa, with over 50 kinds. The plants are distinguished by their lance-shaped leaves and vivid yellow or orange flowers that emerge in the evening.

Traditional medicine uses evening primrose to treat a number of ailments, such as skin disorders, menstrual cramps, and menopause. In landscapes and gardens, it is also employed as an ornamental plant.

Read Also: Plants That Start With P

Onoclea (sensitive fern)

The Onoclea plant, also referred to as skunk cabbage, is a low-growing perennial that is indigenous to eastern North American marshes and streamsides. Its leaves have unique black and white stripes that resemble the fur of a skunk, hence the name.

The plant bears tiny, drooping blooms that are borne on a fleshy spadix encircled by a spathe that resembles a hood. Onoclea plants like full sun to partial shade and grow best in wetlands. Numerous animals, such as otters, muskrats, and beavers, among others, depend heavily on them for sustenance.


Osmanthus is an evergreen shrub or small tree included in East Asia, sometimes referred to as sweet olive or fragmentosa. It has tiny white or yellow flowers that emerge in the autumn, along with oval, lobed leaves.

The main purposes of osmanthus plants are for their aesthetic value and to make aromatic tea. They are valued for both their lovely look and their capacity to offer shade. Traditional Chinese medicine uses the sweet scent of osmanthus to cure a wide range of illnesses.


Oxalis is a genus of flowering plants that includes over 800 species. Oxalis plants are known for their clover-like leaves and colorful flowers. The flowers come in a variety of colors, including yellow, orange, pink, purple, and white.

Oxalis plants are native to tropical and temperate regions around the world. They are popular garden flowers, and they can also be grown indoors.


Orchids are a large and diverse group of flowering plants. Orchids are known for their beautiful, exotic flowers. The flowers come in a variety of colors, shapes, and sizes.

Orchids are native to tropical and temperate regions around the world. They are popular garden flowers, and they can also be grown indoors.

Read Also: Plants That Start With Q

Orangeade bromeliad

An orangeade bromeliad plant is a type of tropical plant that combines the vibrant colors of an orangeade drink with the lush foliage of a bromeliad. The plant produces sweet, tangy fruit that resembles an orange, and its bright yellow bracts resemble the bubbles found in an orangeade drink.

The orangeade bromeliad is a low-maintenance plant that thrives in well-drained soil and receives plenty of indirect sunlight. It is a great addition to any tropical garden and is also known for its medicinal properties, including its ability to aid digestion and boost the immune system.

Here is the list of Plants that start with O

PlantScientific Name
Octopus agaveAgave vilmoriniana
Obscure morning gloryIpomoea obscura
OpuntiaPrickly pear
Old maidCatharanthus roseus
Ornamental OnionAllium
Orange crownshaft palmAreca vestiaria
Orchid CactusEpiphyllum 
Oat GrassArrhenatherum
Orange shrimpJusticia fulvicoma
Opium poppyPapaver somniferum
Old Man’s BeardUsnea
Otak udang tajamBuchanania sessilifolia
Obedient PlantPhysostegia virginiana
Old man of the mountainOreocereus trollii
Oatlandformerly Oat Eater
OphrysBee orchids
Orange medinillaMedinilla scortechinii
Ocimum basilicumbasil
Orange bulbineBulbine frutescens.
Oenothera longifoliaLemon Sunset
Orange milkwoodTabernaemontana aurantiaca
Orange cestrumCestrum aurantiacum
Orange JessamineMurraya paniculata
Ornamental PomegranatePunica granatum L
Orange turneraTurnera aurantiaca
Oregon GrapeMahonia aquifolium
Olive LeafOlea europaea
Ornamental KaleBrassica oleracea
ObecheTriplochiton scleroxylon
Orange tulip gingerCostus productus
OrnithogalumOrnithogalum spp
OchromaOchroma pyramidale
Oval leaf mistletoeViscum ovalifolium
Oxeye DaisyBuphthalmum
OrlayaOrlaya grandiflora
OnopordumOnopordum acanthium
Oak leaf fernDrynaria quercifolia
Oriental LilyLilium orientalis
OleariaOlearia spp
Oriental chain fernWoodwardia orientalis
Osage OrangeMaclura pomifera
OreganoOriganum vulgare
ObedientPhysostegia virginiana
OxypetalumOxypetalum coeruleum
Ozelot swordEchinodorus
OthonnaOthonna spp
Orange BlossomCitrus sinensis
OleanderNerium oleander
OsteospermumOsteospermum spp
Oriental PoppyPapaver orientale
OkraAbelmoschus esculentus
OmbuPhytolacca dioica
OsmorhizaOsmorhiza spp
OrdealErythrophleum suaveolens
OnionAllium cepa
OphiopogonDwarf Lilyturf, Mondo Grass
Ostrich fernMatteuccia
Oxalis TriangularisOxalis triangularis
Order Isoetalesquillworts

Read Also: Plants that Start With M


In conclusion, plants that start with the letter “O” encompass a diverse range of species, including popular choices like oak trees, orchids, and ornamental grasses. These plants showcase varied characteristics, from impressive size and longevity to delicate beauty and unique shapes. The array of “O” plants add richness to horticulture and offer a wide selection for different environments and landscaping preferences. Whether for ornamental, agricultural, or ecological purposes, the diversity of plants starting with “O” contributes significantly to the natural world and human interaction with it.

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