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Oleander
Nerium oleander
A Mediterranean and South Asian evergreen shrub with leathery leaves and showy pink, white, or red flowers, beautiful but among the most poisonous of garden plants.
If you've been searching for plants that start with O, you'll find 4 detailed plants below. We're not interested in giving you only a list of names — every entry on this page links to a full profile with the kind of detail you'd actually want to know.
For plants, that means scientific name, family, plant type, native range, uses, and care notes.
Table of contents
| Oleander | Ornamental Grass | Ostrich Fern | Oxalis |
List of Plants That Start With O
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Ornamental Grass
Miscanthus sinensis
A broad horticultural group of clumping grasses grown for foliage, flower plumes, winter structure, and movement in modern naturalistic gardens.
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Ostrich Fern
Matteuccia struthiopteris
A large North American and European fern named for its vase-shaped clumps of plume-like sterile fronds, the source of edible spring fiddleheads.
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Oxalis
Oxalis triangularis
A vast genus of small clover-like plants found worldwide, grown as a houseplant for purple shamrock and dreaded as a weed in some species and climates.
About plants starting with O
That's our current list of plants starting with the letter O. We add new entries every week — if you have a favorite plant starting with O that isn't on this page, let us know and we'll write it up.
Looking for more? Try plants that end with O, or contain O anywhere in the name.