Plants
Oak leaved hydrangea 'Snowflake'Hydrangea quercifolia 'Snowflake'
Oakleaf hydrangeaHydrangea quercifolia
Obedient Plant 'Summersnow'Physostegia virginiana 'Summersnow'
Obedient-plant Physostegia virginiana
Ocimum basilicum 'African Blue' Ocimum basilicum 'African Blue'
Ocinum basilicum 'Genovese Gigante'Ocinum basilicum 'Genovese Gigante'
Odontioda orchid 'Le Hocq'Odontioda 'Le Hocq'
Odontioda orchid 'Lilly Menuet'Odontioda 'Lilly Menuet'
Odontocidium orchid 'Big Mac Saragosa'Odontocidium 'Big Mac Saragosa'
Odontocidium orchid 'Hansueli isler'Odontocidium 'Hansueli isler'
Odontocidium orchid 'Tiger Crow' - 'Golden Girl'Odontocidium 'Tiger Crow' - 'Golden Girl'
Odontocidium orchid 'Tiger Hambuhren'Odontocidium 'Tiger Hambuhren'
Odontoglossum orchidOdontoglossum cirrhosum
Odontonia orchid 'Oxbow'Odontonia Debutante 'Oxbow'
Oenothera fruticosa 'Fyrverkeri'Oenothera fruticosa 'Fyrverkeri'
Oenothera MacrocarpaOenothera Macrocarpa
Oenothera Speciosa 'Siskiyou'Oenothera Speciosa 'Siskiyou'
okra
Old Man of Mexico CactusCephalocereus senilis
OleanderNerium oleander
Oleaster 'Quicksilver'Elaeagnus angustifolia 'Quicksilver'
Olive treeOlea europaea
Olws eyes CactusMammillaria parkinsonii
Olympian MulleinVerbascum olympicum
Omphalodes Cappadocica 'Starry Eyes'Omphalodes Cappadocica 'Starry Eyes'
Oncidium orchidOncidium ornithorrhyncum
Oncidium Tsuiku MargueriteOncidium Tsuiku Marguerite
OnionAllium cepa
OnionAllium carinatum ssp. pulchellum
Onion Red Barron (GS)
Onion Red Creole
Onions 'Carmen'Allium cepa 'Carmen'
Ontario Poplar 'Aurora'Populus candicans 'Aurora'
OPHIOPOGON jaburanOPHIOPOGON jaburan
Ophiopogon planiscapus 'Niger'Ophiopogon planiscapus 'Niger'