Common plant names.
Below is a list of plant names beginning with the letter 'O', listed by common name. Click a letter of the alphabet to see a list of plants with common names beginning with that letter. Alternatively click here to see the plants listed alphabetically by botanic name.
Common names: ABCDEFGHIJKLMNOPQRSTUVWXYZ
| Common name | Botanic name |
|---|---|
| Oak, English oak, Common oak, pedunculate oak, European oak | Quercus robur |
| Oat | Avena sativa |
| Obovate peony, Mountain peony | Paeonia obovata |
| Ogilvie mountain spring beauty | Claytonia ogilviensis |
| Old lady | Artemisia borealis |
| Old man cactus | Cephalocereus senilis |
| Old Man's beard | Clematis vitalba |
| Olive | Olea europea |
| Onion | Allium |
| Onion, Ornamental onion | Allium 'Globemaster' |
| Onion, Spring onion, salad onion, scallion | Allium cepa |
| Onion | Allium cepa 'Ailsa Craig' |
| Onion | Allium cepa 'Bedfordshire Champion' |
| Onion | Allium cepa 'Californian Red' |
| Onion | Allium cepa 'Japanese Buffalo' F1 hybrid |
| Onion | Allium cepa 'Red Cross' |
| Onion | Allium cepa 'Rijnsburger' |
| Onion | Allium cepa 'Troy' |
| Onion | Allium cepa 'Shakespeare' |
| Oniongrass | Romulea rosea |
| Ontario poplar | Populus x candicans |
| Opposite-leaved pondweed | Groenlandia densa |
| Orange birch bolete | Leccinum versipelle |
| Orange Mint, Eau De Cologne Mint | Mentha x piperita 'Citrata' |
| Orange peel plant, Rainbow plant, Fish mint, Fish leaf | Houttuynia cordata |
| Orange peel plant | Houttuynia cordata 'Variegata' |
| Orange scented thyme | Thymus 'Fragrantissimus' |
| Orange, Sweet orange, Valencia orange | Citrus sinensis |
| Orchid | Dendrobium |
| Orchid | Oncidium |
| Orchid | Orchidaceae 'Versailles' |
| Orchid | Pleione |
| Orchid | Vanda |
| Oregano, Majoram, Wild marjoram | Origanum vulgare |
| Oriental poppy, Poppy | Papaver orientale |
| Oriental poppy | Papaver orientale 'Beauty of Livermere' |
| Oriental poppy | Papaver orientale 'Harvest Moon' |
| Oriental poppy | Papaver orientale 'Patty's Plum' |
| Oriental poppy | Papaver orientale 'Türkenlouis' |
| Oriental Poppy | Papaver orientale (Oriental Group) 'Brilliant' |
| Oriental Poppy | Papaver orientale (Oriental Group) 'Checkers' |
| Oriental Poppy | Papaver orientale (Oriental Group) 'Prinzessin Victoria Louise' |
| Ornamental blackberry | Rubus biflorus |
| Ornamental kiwi fruit, Variegated-leaf hardy kiwi | Actinidia kolomikta |
| Ornamental maize, Sweet corn, Sweetcorn | Zea mays |
| Ornamental onion | Allium hollandicum 'Purple sensation' |
| Ornamental onion | Allium vineale |
| Ornamental onion | Allium 'Millenium' |
| Ornamental onion | Allium lusitanicum 'Summer Beauty' |
| Ornamental onion | Allium 'Mont Blanc' |
| Ornamental pear | Pyrus calleryana 'Chanticleer' |
| Ornamental pepper, Capsicum | Capsicum annuum 'Holiday Cheer' |
| Ornamental quince | Chaenomeles speciosa 'Moerloosei' |
| Ornamental quince, Chinese flowering quince, Japonica | Chaenomeles speciosa |
| Ornamental raspberry, Thimbleberry | Rubus odoratus |
| Ornamental winter kale | Brassica oleracea 'Northern Lights' |
| Osage orange, horse apple, monkey ball, hedge apple tree | Maclura pomifera |
| Oshima cherry | Prunus speciosa |
| Osier, Common osier | Salix viminalis |
| Oso Berry | Oemleria cerasiformis |
| Oval leaf privet, Privet | Ligustrum ovalifolium |
| Oval sedge | Carex ovalis |
| Ox eye daisy | Chrysanthemum leucanthemum |
| Ox-eye daisy | Leucanthemum vulgare |
| Oxlip | Primula elatior |
