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Top 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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- Obregonia
- Ochagavia
- Ochna
- Ocimum
- Odontioda (hybrid orchid genus)
- Odontocidium (hybrid orchid genus)
- Odontoglossum (an orchid genus)
- Odontonema
- Odontonia (hybrid orchid genus)
- Oemleria
- Oenanthe (water dropwort)
- Oenothera (evening primrose, sundrops)
- Olea (olive)
- Olearia (daisy bush)
- Olneya
- Olsynium
- Omphalodes (navelwort)
- Omphalogramma
- Oncidium (an orchid genus)
- Onoclea
- Ononis (restharrow)
- Onopordum
- Onosma
- Oophytum
- Ophiopogon (lilyturf)
- Ophrys (an orchid genus)
- Ophthalmophyllum
- Oplismenus
- Opuntia (prickly pears, chollas and many other cactus species)
- Orbea
- Orbeopsis
- Orchis (an orchid genus)
- Oreocereus
- Origanum (marjoram, oregano)
- Orixa
- Ornithogalum
- Ornithophora
- Orontium (golden club)
- Orostachys
- Oroya
- Ortegocactus
- Orthophytum
- Orthrosanthus
- Orychophragmus
- Oryza (rice)
- Osbeckia
- Osmanthus
- Osmarea
- Osmaronia
- Osmunda (royal fern)
- Osteomeles
- Osteospermum
- Ostrowskia (giant bellflower)
- Ostrya
- Othonna
- Ourisia
- Oxalis (shamrock, sorrel)
- Oxydendrum
- Ozothamnus
Read more about this topic: List Of Garden Plants