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Oak Leaf Ivy (Cissus rhombifolia)
Oak Leafed Geranium (Pelargonium quercifolium)
Oak-Leaf Hydrangea (Hydrangea quercifolia)
Oakleaf Mountain Ash (Sorbus Χ hybrida)
Oaxaca Palmetto (Sabal mexicana)
Obedient Plant (Physostegia virginiana)
Ocean Spray (Holodiscus discolor)
Oceanblue Morning-glory (Ipomoea indica)
Oconee Bells (Shortia galacifolia)
Ocotillo (Fouquieria splendens)
Octopus Agave (Agave vilmoriniana)
Octopus Cactus (Stenocereus alamosensis)
Octopus Tree (Didierea madagascariensis)
Octopus Tree (Didierea trollii)
Octopus Tree (Schefflera actinophylla)
Officinal Spurge (Euphorbia resinifera)
Ohio Buckeye (Aesculus glabra)
Okame zasa (Shibataea kumasaca)
Okinawan Holly (Ilex dimorphophylla)
Oklahoma Redbud (Cercis reniformis)
Okra (Abelmoschus esculentus)
Olaga (Opuntia borinquensis)
Old Lady Cactus (Mammillaria hahniana)
Old Man (Artemisia abrotanum)
Old Man Beard (Clematis drummondii)
Old Man Cactus (Cephalocereus senilis)
Old Man of Mexico (Cephalocereus senilis)
Old Man of the Andes (Oreocereus celsianus)
Old Man of the Mountain (Oreocereus trollii)
Old Man Saltbush (Atriplex nummularia)
Old Woman (Artemisia stelleriana)
Old-fashioned weigela (Weigela florida)
Oleander (Nerium oleander)
Oleander-Leaved Protea (Protea neriifolia)
Olive (Olea europaea)
Oneseed Hawthorn (Crataegus monogyna)
Opium Poppy (Papaver somniferum)
Orange Ball Tree (Buddleia globosa)
Orange Butterfly Bush (Buddleia globosa)
Orange Cestrum (Cestrum aurantiacum)
Orange Clock Vine (Thunbergia gregorii)
Orange Cob Cactus (Echinopsis famatimensis)
Orange Coneflower (Rudbeckia fulgida)
Orange Cotoneaster (Cotoneaster franchetii)
Orange Jessamine (Murraya paniculata)
Orange King (Berberis linearifolia)
Orange Lily (Lilium bulbiferum)
Orange Mint (Mentha aquatica var. 'Citrata')
Orange Plume Flower (Justicia spicigera)
Orange River Lily (Crinum bulbispermum)
Orange Trumpet Flower (Tecoma Χ 'Burnt-Out')
Orange Tulip Ginger (Costus curvibracteatus)
Orange Zexmenia (Zexmenia hispida)
Orchid Rockrose (Cistus Χ purpureus)
Orchid Tree (Bauhinia monandra)
Orchid Tree (Bauhinia variegata)
Orcutt's Liveforever (Dudleya attenuata)
Oregano (Origanum vulgare)
Oregon Ash (Fraxinus latifolia)
Oregon Boxleaf (Paxistima myrsinites)
Oregon Fleabane (Erigeron speciosus)
Oregon Grape (Mahonia aquifolium)
Oregon maple (Acer macrophyllum)
Oregon Myrtle (Umbellularia californica)
Oregon Oxalis (Oxalis oregana)
Oregon White Oak (Quercus garryana)
Oregon Yew (Taxus brevifolia)
Organ Mountain Foxtail Cactus (Escobaria organensis)
Organ Pipe Cactus (Stenocereus thurberi)
Organillo (Grusonia bradtiana)
Organillo (Selenicereus grandiflorus)
Organito de Vibora (Peniocereus viperinus)
Organo (Cephalocereus columna-trajani)
Organo (Pachycereus marginatus)
Organpipe Cactus (Stenocereus thurberi ssp. littoralis)
Oriental arborvitae (Platycladus orientalis)
Oriental Fountaingrass (Pennisetum orientale)
Oriental Garlic (Allium tuberosum)
Oriental Pear (Pyrus pyrifolia)
Oriental Photinia (Photinia villosa)
Oriental Poppy (Papaver orientale)
Oriental Spruce (Picea orientalis)
Oriental Sweet Gum (Liquidambar orientalis)
Ornamental Catmint (Nepeta Χ faassenii)
Ornamental Corn (Zea mays)
Ornamental Onion (Allium aflatunense)
Ornamental Onion (Allium karataviense)
Ornamental Origano (Origanum laevigatum)
Ornamental Pepper (Capsicum annuum)
Orphine (Hylotelephium spectabile)
Orumbeva (Cereus kroenleinii)
Osage Orange (Maclura pomifera)
Osteospermum Dandenong PPAF (Osteospermum)
Osteospermum 'Symphony' (Osteospermum)
Ostrich Fern (Matteuccia struthiopteris)
Oswego Tea (Monarda didyma)
Our Lord's Candle (Yucca whipplei)
Oval Leaf Privet (Ligustrum ovalifolium)
Oval-leaf Cassia (Senna artemisioides ssp. oligophylla)
Ovens Wattle (Acacia pravissima)
Owl's Eyes (Mammillaria parkinsonii)
Ox Eye (Heliopsis helianthoides var. scabra)
Ox Tongue Lily (Haemanthus coccineus)
Ox-eye Daisy (Leucanthemum vulgare)
Oxlip (Primula elatior)
Oyama Magnolia (Magnolia sieboldii)
Oyster Plant (Rhoeo spathacea)
Ozark Blue Star Flower (Amsonia illustris)
Ozark Sundrop (Oenothera macrocarpa)
Ozark Witchhazel (Hamamelis vernalis)

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