O Isami Maple ( Acer japonicum ) O Niji Camellia ( Camellia japonica )
O Sole Mio Fuchsia ( Fuchsia ) O Taki Maple ( Acer japonicum )
OConnor Juniper ( Juniperus virginiana ) OHenry Peach ( Prunus persica )
OOdham Dipper White Flowered Gourd ( Lagenaria Siceraria ) OOdham Small Bilobal White Flowered Gourd ( Lagenaria Siceraria )
OSpring Holly ( Ilex cornuta ) Oachs ( Ilex opaca )
Oadi Begonia ( Begonia Oadi ) Oak Grove No 1 ( Ilex opaca )
Oak Grove No 2 ( Ilex opaca ) Oak Hill No 1 ( Ilex opaca )
Oak Leaf Acanthus ( Acanthus mollis ) Oak Leaf Common Laburnum ( Laburnum anagyroides )
Oak Leaf Lettuce ( Lactuca sativa ) Oakington Jewel Coral Flower ( Heuchera brizoides )
Oakland Fuchsia ( Fuchsia ) Oaklea Red Penstemon ( Penstemon )
Oakleaf Hydrangea ( Hydrangea quercifolia ) Oakleaf Tiarella ( Tiarella wherryi )
Oaxacan Green Dent Corn ( Zea mays ) Oban Iris ( Iris )
Obconica Primrose ( Primula obconica ) Obdam Narcissus ( Narcissus )
Obelisk Chinese Juniper ( Juniperus chinensis ) Obelisk Gladiolus ( Gladiolus )
Obergdrtner Nietner Mollis Hybrid Azalea ( Rhododendron ) Oberon Freesia ( Freesia )
Oberon Fuchsia ( Fuchsia ) Oberon Prairie Mallow ( Sidalcea malviflora )
Oberon Torch Azalea ( Rhododendron kaempferi ) Obliqua Begonia ( Begonia obliqua )
Obovata Firedragon ( Acalypha wilkesiana ) Obovata Peony ( Paeonia obovata )
Obscura Begonia ( Begonia obscura ) Obscura Marginata Hosta ( Hosta )
Ocala Begonia ( Begonia Ocala ) Ocampoi Cactus ( Parodia ocampoi )
Occidentale Lily ( Lilium occidentale ) Occold Lagoon Geranium ( Pelargonium )
Ocean Beach Fuchsia ( Fuchsia ) Ocean Gold Western Azalea ( Rhododendron occidentale )
Ocean Mist Western Azalea ( Rhododendron occidentale ) Ocean Spray Maidenhair Fern ( Adiantum raddianum )
Oceanas Summer Pole Bean ( Phaseolus vulgaris ) Oceanside Begonia ( Begonia Oceanside )
Ochroleuca Ghent Hybrid Azalea ( Rhododendron hybrida ) Ochroleuca Potentilla ( Potentilla fruticosa )
Ocmulgee Crapemyrtle ( Lagerstroemia indica ) Oconee Azalea ( Rhododendron flammeum )
Oconee Bells ( Shortia galacifolia ) Oconee Sweetgum ( Liquidambar styraciflua )
Octavia Hill Rose ( Rosa ) Octavian Robin Hill Azalea ( Rhododendron hybrida )
October Brilliance Red Maple ( Acer rubrum ) October Glory Flowering Dogwood ( Cornus florida )
October Glory Red Maple ( Acer rubrum ) October Glow ( Ilex opaca )
Octopus Agave ( Agave vilmoriniana ) Octopus Tree ( Schefflera actinophylla )
Odalisque Hardy Water Lily ( Nymphaea ) Odalisque Tulip ( Tulipa pulchella )
Odawa Indian Bush Bean ( Phaseolus vulgaris ) Odd Ball Fuchsia ( Fuchsia )
Odd Beauty Fuchsia ( Fuchsia ) Oddity Hens and Chicks ( Sempervivum tectorum )
Ode to Beauty African Violet ( Saintpaulia ionantha ) Odessa Zucchini Summer Squash ( Cucurbita pepo )
Odessey Begonia ( Begonia Odessey ) Odeteiantha Begonia ( Begonia odeteiantha )
Odile Peony ( Paeonia lactiflora ) Odin Mollis Hybrid Azalea ( Rhododendron )
Odontoglossum Orchid ( Odontoglossum spectatissimum ) Odorata Crabapple ( Malus baccata )
Odyssey Corn ( Zea mays ) Oekonomierat Echtermeyer Flowering Crabapple ( Malus hybrida )
Official Magnolia ( Magnolia officinalis ) Ogallala Strawberry ( Fragaria )
Ogden Melon ( Cucumis melo ) Ogeechee Tupelo ( Nyssa ogeche )
Ogi no Odorikaraki Kurume Azalea ( Rhododendron ) Ogikasane Kurume Azalea ( Rhododendron )
Ogon False Holly ( Osmanthus heterophyllus ) Ogon Japanese Rush ( Acorus gramineus )
Ogon Spirea ( Spiraea thunbergii ) Ogon no Mai Satsuki Azalea ( Rhododendron hybrida )
Ogon no Tsuki Satsuki Azalea ( Rhododendron hybrida ) Oh Boy Fuchsia ( Fuchsia )
Oh My Satsuki Azalea ( Rhododendron hybrida ) Oh No Begonia ( Begonia Oh No )
Oh Razzberries Begonia ( Begonia Oh Razzberries ) Ohio Buckeye ( Aesculus glabra )
Ohio King ( Ilex opaca ) Ohio MR 13 Pink Tomato ( Lycopersicon esculentum )
Ohio Queen ( Ilex opaca ) Ohlendorffii American Arborvitae ( Thuja occidentalis )
Ohlendorffii Norway Spruce ( Picea abies ) Oimatsu Kurume Azalea ( Rhododendron )
Oino Mezame Kurume Azalea ( Rhododendron ) Ojai Begonia ( Begonia Ojai )
Ojo de Cabro Bean ( Phaseolus vulgaris ) Okame Nandina ( Nandina domestica )
Okina Nishiki Satsuki Azalea ( Rhododendron hybrida ) Okinawa Peony ( Paeonia lactiflora )
Oklahoma Delaware Blue Corn ( Zea mays ) Oklahoma Delaware White Corn ( Zea mays )
Oklahoma Eastern Redbud ( Cercis canadensis ) Oklahoma Zinnia ( Zinnia elegans )
Okrent ( Ilex opaca ) Okusankichi Asian Pear ( Pyrus pyrifolia )
Olaf Tulip ( Tulipa ) Olbrichii False Cypress ( Chamaecyparis lawsoniana )
Old Black Rose ( Rosa ) Old Blush China Rose ( Rosa )
Old Candy Pink Penstemon ( Penstemon ) Old Del Monte Fuchsia ( Fuchsia )
Old Double White Camellia ( Camellia japonica ) Old Faithful ( Ilex opaca )
Old Faithful Gable Hybrid Azalea ( Rhododendron ) Old Faithful Peony ( Paeonia lactiflora )
Old Fashioned Soldier Bush Bean ( Phaseolus vulgaris ) Old Field Birch ( Betula populifolia )
Old Glory Rose ( Rosa ) Old Gold ( Ilex opaca )
Old Gold Chinese Juniper ( Juniperus chinensis ) Old Gold Exbury Azalea ( Rhododendron )
Old Heavy Berry American Holly ( Ilex opaca ) Old Lace Begonia ( Begonia Old Lace )
Old Lace Fuchsia ( Fuchsia ) Old Lace Maidenhair Fern ( Adiantum raddianum )
Old Lace Peony ( Paeonia lactiflora ) Old Leather Leaf ( Ilex opaca )
Old Maid ( Catharanthus roseus ) Old Mans Bones Sedum ( Sedum divergens )
Old Master Rose ( Rosa ) Old Mexico Zinnia ( Zinnia haageana )
Old Port Camellia ( Camellia japonica ) Old Port Catawba Rhododendron ( Rhododendron catawbiense )
Old Siwash Peony ( Paeonia lactiflora ) Old Smokey Begonia ( Begonia Old Smokey )
Old Smoky Fuchsia ( Fuchsia ) Old Spanish Rose Rose ( Rosa )
Old Spice Geranium ( Pelargonium ) Old Time Sanguinea Begonia ( Begonia Old Time Sanguinea )
Old Westbury Yew ( Taxus media ) Old White Egg Eggplant ( Solanum melongena )
Old Witch Begonia ( Begonia Old Witch ) Old Woman Begonia ( Begonia Old Woman )
Old Yellow Dusty Miller Primrose ( Primula ) Old mans beard ( Chionanthus virginicus )
Old-Fashioned Fuchsia ( Fuchsia ) Old-fashioned Weigela ( Weigela florida )
Olde Fragrance Rose ( Rosa ) Oldhams Bamboo ( Bambusa oldhamii )
Ole Pepperpot Capsicum Pepper ( Capsicum annuum ) Ole Sorenson Begonia ( Begonia Ole Sorenson )
Oleander ( Nerium oleander ) Olearia Combers Pink ( Olearia phlogopappa )
Oleifera Camellia ( Camellia oleifera ) Oleosus Bamboo ( Pleioblastus oleosus )
Olfri Begonia ( Begonia Olfri ) Olga Crabapple ( Malus )
Olga Holly ( Ilex cornuta ) Olga Mezitt P.J.M. Rhododendron ( Rhododendron )
Olga Niblett Robin Hill Azalea ( Rhododendron hybrida ) Olga Orchid ( Odontonia )
Olga Teupel Begonia ( Begonia Olga Teupel ) Olia Pear ( Pyrus communis )
Olive Bailey Langdon Daylily ( Hemerocallis hybrida ) Olive Coleus ( Solenostemon scutellarioides )
Olive Jackson Fuchsia ( Fuchsia ) Olive Milliman Begonia ( Begonia Olive Milliman )
Olive Smith Fuchsia ( Fuchsia ) Olive Squash ( Cucurbita maxima )
Oliver Brussels Sprout ( Brassica oleracea ) Oliver Wyatt Lily ( Lilium parryi )
Olivette Blanche Grape ( Vitis vinifera ) Olivier de Serres Common Lilac ( Syringa vulgaris )
Ollioules Tulip ( Tulipa ) Olmeca Bamboo ( Olmeca recta )
Olmsted Norway Maple ( Acer platanoides ) Olympia Red Begonia ( Begonia Olympia Red )
Olympia Spinach ( Spinacia oleracea ) Olympiad Fuchsia ( Fuchsia )
Olympiad Rose ( Rosa ) Olympiad Tall Bearded Iris ( Iris )
Olympic Fire Mountain Laurel ( Kalmia latifolia ) Olympic Flame Tulip ( Tulipa )
Olympic Gold Narcissus ( Narcissus ) Olympic Hybrids Lily ( Lilium )
Olympic Lass Fuchsia ( Fuchsia ) Olympic Tomato ( Lycopersicon esculentum )
Olympic Wedding Mountain Laurel ( Kalmia latifolia ) Olympica Bellflower ( Campanula rotundifolia )
Olympus Sweet Cherry ( Prunus ) Omaha Japanese Plum ( Prunus salicina )
Omar Pasha Fuchsia ( Fuchsia ) Omarana Tropical Water Lily ( Nymphaea )
Omars Cup Siberian Iris ( Iris sibirica ) Omars Touch Arilbred Bearded Iris ( Iris )
Omati Begonia ( Begonia Omati ) Omega Lily ( Lilium )
Omega Phlox ( Phlox maculata ) Omei Rose ( Rosa omeiensis )
Omen Glenn Dale Azalea ( Rhododendron hybrida ) Omeomy Fuchsia ( Fuchsia )
Omoi no Maku Satsuki Azalea ( Rhododendron hybrida ) Omoine Kurume Azalea ( Rhododendron )
On Target Begonia ( Begonia On Target ) Onahama Peony ( Paeonia lactiflora )
Onaveno Corn ( Zea mays ) Onaway Potato ( Solanum tuberosum )
Oncidium Orchid ( Oncidium pusillum ) Oncocyclus Bearded Iris ( Iris iberica )
Oncocyclus bearded Iris ( Iris iberica, subsp. elegantissima ) One in the Ring Fuchsia ( Fuchsia )
One-O-One Exbury Azalea ( Rhododendron ) One-leaved Ash ( Fraxinus excelsior )
Oneda Lake Begonia ( Begonia Oneda Lake ) Oneida Linden Viburnum ( Viburnum dilatatum )
Onetia Holland Camellia ( Camellia japonica ) Onion ( Allium affatunense )
Onland Blue Common Periwinkle ( Vinca minor ) Onna Fuchsia ( Fuchsia )
Onondaga Peony ( Paeonia lactiflora ) Onondaga Sargent Viburnum ( Viburnum sargentii )
Onsho Satsuki Azalea ( Rhododendron hybrida ) Ontario Grape ( Vitis )
Ontario Hybrid Red 775 Tomato ( Lycopersicon esculentum ) Onward Pear ( Pyrus communis )
Oodham Pink Bean ( Phaseolus vulgaris ) Oogata Fukuyu Tomato ( Lycopersicon esculentum )
Oogocho Kurume Azalea ( Rhododendron ) Oosterwijk Holly ( Ilex verticillata )
Oouchi Yama Kurume Azalea ( Rhododendron ) Opaal Hinoki False Cypress ( Chamaecyparis obtusa )
Opal Hamilton Peony ( Paeonia lactiflora ) Opalescent Fuchsia ( Fuchsia )
Opaline Begonia ( Begonia Opaline ) Opera Glenn Dale Azalea ( Rhododendron hybrida )
Opera Summer Lilac ( Buddleia davidii ) Ophelia Mollis Hybrid Azalea ( Rhododendron )
Ophelia Rose ( Rosa ) Ophelia Torch Azalea ( Rhododendron kaempferi )
Opherie Ghent Hybrid Azalea ( Rhododendron hybrida ) Ophiopogon Spicata ( Liriope spicata )
Ophrys Orchid ( Ophrys lutea ) Opipara Hosta ( Hosta )
Opium Poppy ( Papaver somniferum ) Opopeo Amaranth ( Amaranthus cruentus )
Optic Illusion Dahlia ( Dahlia ) Optica Stone Plant ( Lithops optica )
Optima Begonia ( Begonia Optima ) Optima Ghent Hybrid Azalea ( Rhododendron hybrida )
Optima Lettuce ( Lactuca sativa ) Optima Mauve Pink Camellia ( Camellia japonica )
Optima Pink Sport Camellia ( Camellia japonica ) Optima Rosea Camellia ( Camellia japonica )
Optimara Colorado African Violet ( Saintpaulia ionantha ) Optuntia Cactus ( Opuntia optuntia )
Opuntia Cactus ( Opuntia atrovirens ) Ora Wilson Begonia ( Begonia Ora Wilson )
Oracle Glenn Dale Azalea ( Rhododendron hybrida ) Oranea Mollis Hybrid Azalea ( Rhododendron )
Orange Appeal Geranium ( Pelargonium ) Orange Ball Ilam Hybrid Azalea ( Rhododendron )
Orange Beauty Kurume Azalea ( Rhododendron ) Orange Beauty Torch Azalea ( Rhododendron kaempferi )
Orange Blossom Hardy Water Lily ( Nymphaea ) Orange Bouquet Tulip ( Tulipa )
Orange Boy Tulip ( Tulipa kaufmanniana ) Orange Cassini Tulip ( Tulipa )
Orange Chimes Belgian Indian Hybrid Azalea ( Rhododendron ) Orange Cling Peach ( Prunus persica )
Orange Cocktail Fuchsia ( Fuchsia ) Orange Coral Bell Kurume Azalea ( Rhododendron )
Orange Crush Fuchsia ( Fuchsia ) Orange Cup Kurume Azalea ( Rhododendron )
Orange Delight Begonia ( Begonia Orange Delight ) Orange Drops Fuchsia ( Fuchsia )
Orange Elite Tulip ( Tulipa ) Orange Emperor Tulip ( Tulipa )
Orange Favorite Kaempferi Hybrid Azalea ( Rhododendron kaempferi ) Orange Favorite Tulip ( Tulipa )
Orange Flame Oregon grape ( Mahonia aquifolium ) Orange Flare Fuchsia ( Fuchsia )
Orange Giant Amaranth ( Amaranthus cruentus ) Orange Giant Torch Azalea ( Rhododendron kaempferi )
Orange Globe Trollius ( Trollius cultorum ) Orange Glory Fuchsia ( Fuchsia )
Orange Glory Peony ( Paeonia lactiflora ) Orange Glow Fuchsia ( Fuchsia )
Orange Glow Mollis Hybrid Azalea ( Rhododendron ) Orange Goblet Tulip ( Tulipa )
Orange Gold Peony ( Paeonia lactiflora ) Orange Grande Capsicum Pepper ( Capsicum annuum )
Orange Jelly Turnip ( Brassica rapa ) Orange King Bougainvillea ( Bougainvillea buttiana )
Orange King Calendula ( Calendula officinalis ) Orange King California Poppy ( Eschscholzia californica )
Orange King Fuchsia ( Fuchsia ) Orange King Temple Bells ( Smithiantha )
Orange King Torch Azalea ( Rhododendron kaempferi ) Orange Lace Peony ( Paeonia lactiflora )
Orange Lantana ( Lantana montevidensis ) Orange Man Ghent Hybrid Azalea ( Rhododendron hybrida )
Orange Melon ( Cucumis melo ) Orange Mirage Fuchsia ( Fuchsia )
Orange Monarch Tulip ( Tulipa ) Orange Nassau Tulip ( Tulipa )
Orange Oxheart Tomato ( Lycopersicon esculentum ) Orange Parade Begonia ( Begonia Orange Parade )
Orange Perfection Garden Phlox ( Phlox paniculata ) Orange Pride Southern Indian Hybrid Azalea ( Rhododendron )
Orange Princess Trollius ( Trollius cultorum ) Orange Queen Daffodil ( Narcissus jonquilla )
Orange Queen Fuchsia ( Fuchsia ) Orange Queen Poppy ( Eschscholzia californica )
Orange Queen Tomato ( Lycopersicon esculentum ) Orange Queen heather ( Calluna vulgaris )
Orange Ricard Geranium ( Pelargonium ) Orange Rubra Begonia ( Begonia Orange Rubra )
Orange Sander Belgian Indian Azalea ( Rhododendron ) Orange Sensation Rose ( Rosa )
Orange Sherbet Greenwood Hybrid Azalea ( Rhododendron ) Orange Slices Tall Bearded Iris ( Iris )
Orange Star Zinnia ( Zinnia haageana ) Orange Sun Tulip ( Tulipa )
Orange Sunblaze Rose ( Rosa ) Orange Supreme Begonia ( Begonia Orange Supreme )
Orange Supreme Exbury Azalea ( Rhododendron ) Orange Sweet Apple ( Malus domestica )
Orange Tiger Standard Dwarf Bearded Iris ( Iris ) Orange Toronto Tulip ( Tulipa )
Orange Triumph Lily ( Lilium ) Orange Triumph Rose ( Rosa )
Orange Triumph Tulip ( Tulipa ) Orange Truffles Knap Hill Azalea ( Rhododendron )
Orange Wonder Tulip ( Tulipa ) Orangeade Begonia ( Begonia Orangeade )
Orangeade Knap Hill Azalea ( Rhododendron ) Orangefeuer Begonia ( Begonia Orangefeuer )
Oranges and Lemons Rose ( Rosa ) Orania Begonia ( Begonia Orania )
Oranje Boven Fuchsia ( Fuchsia ) Oranje Van Os Fuchsia ( Fuchsia )
Oratorio Tulip ( Tulipa ) Orb Begonia ( Begonia Orb )
Orbec Orchid ( Odontocidium ) Orbit Magnolia ( Magnolia grandiflora )
Orcas Pear ( Pyrus communis ) Orchardgrass ( Dactylis glomerata )
Orchid ( Orchid ) Orchid Beauty Summer Lilac ( Buddleia davidii )
Orchid Cactus ( Nopalxochia ) Orchid Lights Northern Lights Azalea ( Rhododendron )
Orchid Pepper ( Capsicum baccatum ) Orchid Pericat Hybrid Azalea ( Rhododendron )
Orchid Pink Camellia ( Camellia japonica ) Orchid Rockrose ( Cistus purpureus )
Orchid Star ( Nymphaea flavovirens ) Orchid Star Pentas ( Pentas )
Orchioides Cape Cowslip ( Lachenalia orchioides ) Orchiphilla Belgian Indian Azalea ( Rhododendron )
Ordono Pepper ( Capsicum annuum ) Ore Beni Kurume Azalea ( Rhododendron )
Oregon Ash ( Fraxinus latifolia ) Oregon Boxwood ( Paxistima myrtifolia )
Oregon Crabapple ( Malus fusca var. levipes ) Oregon Crested Hinoki False Cypress ( Chamaecyparis obtusa )
Oregon Eleven Tomato ( Lycopersicon esculentum ) Oregon Fuchsia ( Fuchsia )
Oregon Giant Pole Bean ( Phaseolus vulgaris ) Oregon Giant Snow Pea ( Pisum sativum )
Oregon Grapeholly ( Mahonia aquifolium ) Oregon Maple ( Acer macrophyllum )
Oregon Pioneer Shelling Pea ( Pisum sativum ) Oregon Pride Kaempferi Hybrid Azalea ( Rhododendron kaempferi )
Oregon Pride Norway Maple ( Acer platanoides ) Oregon Pride Tomato ( Lycopersicon esculentum )
Oregon Spring Tomato ( Lycopersicon esculentum ) Oregon Star Tomato ( Lycopersicon esculentum )
Oregon State U Begonia ( Begonia Oregon State U ) Oregon Sugar Pod II Snow Pea ( Pisum sativum )
Oregon Sugar Pod Snow Pea ( Pisum sativum ) Oregon Sunset Begonia ( Begonia Oregon Sunset )
Oregon Trail Fuchsia ( Fuchsia ) Oregon Trail Shelling Pea ( Pisum sativum )
Oregon Vine Maple ( Acer circinatum ) Oregon White Oak ( Quercus garryana )
Oregon grape ( Mahonia x media ) Oreola Holly ( Ilex attenuata )
Organdy Mixture Begonia ( Begonia Organdy Mixture ) Organensis Passionflower ( Passiflora organensis )
Organza Fuchsia ( Fuchsia ) Orient Exbury Azalea ( Rhododendron )
Orient Express Cucumber ( Cucumis sativus ) Orient Express Eggplant ( Solanum melongena )
Orient Express Fuchsia ( Fuchsia ) Orient Express Tulip ( Tulipa )
Orient Pear ( Pyrus communis ) Oriental Arborvitae ( Thuja orientalis )
Oriental Beauty Tulip ( Tulipa ) Oriental Beech ( Fagus orientalis )
Oriental Gold Peony ( Paeonia lactiflora ) Oriental Lace Fuchsia ( Fuchsia )
Oriental Lantern Fuchsia ( Fuchsia ) Oriental Music Begonia ( Begonia Oriental Music )
Oriental Night Sweet Alyssum ( Lobularia maritima ) Oriental Oak ( Quercus variabilis )
Oriental Photinia ( Photinia villosa ) Oriental Poppy ( Papaver orientale )
Oriental Princess Fuchsia ( Fuchsia ) Oriental Spicebush ( Lindera benzoin )
Oriental Splendour Tulip ( Tulipa ) Oriental Spruce ( Picea orientalis )
Oriental Sunrise Fuchsia ( Fuchsia ) Oriental Sweetgum ( Liquidambar orientalis )
Oriental White Oak ( Quercus aliena ) Orientale Exbury Azalea ( Rhododendron )
Orientale Fountain Grass ( Pennisetum orientale ) Oriflamme Glenn Dale Azalea ( Rhododendron hybrida )
Orin Apple ( Malus domestica ) Oriole Apple ( Malus domestica )
Oriole Capsicum Pepper ( Capsicum annuum ) Oriole Fuchsia ( Fuchsia )
Oriole Holly ( Ilex attenuata ) Orion ( Fritillaria meleagris )
Orion Fuchsia ( Fuchsia ) Orion Kurume Azalea ( Rhododendron )
Orison Glenn Dale Azalea ( Rhododendron hybrida ) Orlando Pride ( Ilex opaca )
Orlando Roberts Peony ( Paeonia lactiflora ) Orleans Reinette Apple ( Malus domestica )
Ormistron Roy Flowering Crabapple ( Malus hybrida ) Ormswell Meconopsis ( Meconopsis sheldonii )
Ornament Tulip ( Tulipa ) Ornamental Pepper ( Capsicum annuum )
Ornamental Popcorn Corn ( Zea mays ) Ornita Begonia ( Begonia Ornita )
Ornithophora Orchid ( Ornithophora radicans ) Oroma Tomato ( Lycopersicon esculentum )
Orpha C. Fox Begonia ( Begonia Orpha C. Fox ) Orphan Begonia ( Begonia Orphan )
Orpheus Glenn Dale Azalea ( Rhododendron hybrida ) Orpine ( Sedum telephium )
Orrell Begonia ( Begonia Orrell ) Ortega Capsicum Pepper ( Capsicum annuum )
Ortega Grape ( Vitis vinifera ) Ortgiesiana Alba Tropical Water Lily ( Nymphaea )
Ortgiesiana Rubra Tropical Water Lily ( Nymphaea ) Orthenburger Festival Fuchsia ( Fuchsia )
Ortley Apple ( Malus domestica ) Orville Fay Iris ( Iris )
Orwell Fuchsia ( Fuchsia ) Orwell Knap Hill Azalea ( Rhododendron )
Oryx Western Azalea ( Rhododendron occidentale ) Osage Crapemyrtle ( Lagerstroemia indica )
Osage Gladiolus ( Gladiolus primulinus ) Osage Orange ( Maclura pomifera )
Osage Peony ( Paeonia lactiflora ) Osakazuki Satsuki Azalea ( Rhododendron hybrida )
Osaraku Kurume Azalea ( Rhododendron ) Osborn Prolific Fig ( Ficus carica )
Oscar I Ghent Hybrid Azalea ( Rhododendron hybrida ) Osceola Begonia ( Begonia Osceola )
Oshio Beni Japanese Maple ( Acer palmatum ) Osiris Lotus ( Nelumbo )
Oslo Daffodil ( Narcissus ) Osman Crabapple ( Malus )
Osmarea ( Osmarea ) Osmin Sweet Basil ( Ocimum basilicum )
Osmington Narcissus ( Narcissus ) Osota Begonia ( Begonia Osota )
Osprey ( Tradescantia Andersoniana Group ) Osprey Knap Hill Azalea ( Rhododendron )
Osprey Penstemon ( Penstemon ) Osprey Plantain Lily ( Hosta )
Ossi Oswalda Tulip ( Tulipa ) Ostara Dutch Hyacinth ( Hyacinthus orientalis )
Ostbo Red Mountain Laurel ( Kalmia latifolia ) Ostfriesland or East Friesland Sage ( Salvia superba )
Ostii Peony ( Paeonia ostii ) Ostrich Fern ( Matteucia struthiopteris )
Ostrowskiana Tulip ( Tulipa ostrowskiana ) Oswald de Kerchove Mollis Hybrid Azalea ( Rhododendron )
Otahuhu Beauty Camellia ( Camellia japonica ) Otaksa Hydrangea ( Hydrangea macrophylla )
Otatea Bamboo ( Otatea fimbriata ) Othello Begonia ( Begonia Othello )
Othello Black Bamboo ( Phyllostachys nigra ) Othello Fuchsia ( Fuchsia )
Othello Kaempferi Hybrid Azalea ( Rhododendron kaempferi ) Other Fellow Fuchsia ( Fuchsia )
Otohime Rose ( Rosa ) Otome Camellia ( Camellia rusticana )
Otome Kurume Azalea ( Rhododendron ) Otome Pink Chrysanthemum ( Chrysanthemum )
Otome Satsuki Azalea ( Rhododendron hybrida ) Otome Zakura Satsuki Azalea ( Rhododendron hybrida )
Otome gokora Kyushu Azalea ( Rhododendron kiusianum ) Otome no Mai Satsuki Azalea ( Rhododendron hybrida )
Otto Alfred Begonia ( Begonia Otto Alfred ) Otto Froebel Peony ( Paeonia lactiflora )
Otto Fuchsia ( Fuchsia ) Otto Furst Fuchsia ( Fuchsia )
Otto Hacker Begonia ( Begonia Otto Hacker ) Otto Krunze Fuchsia ( Fuchsia )
Otto Lilienthal Mollis Hybrid Azalea ( Rhododendron ) Otto Luyken English Laurel ( Prunus laurocerasus )
Ottonis Begonia ( Begonia ottonis ) Ottonis Cactus ( Parodia ottonis )
Otzeniana Living Stone ( Lithops otzeniana ) Ouachita Gold Peach ( Prunus persica )
Ouchiyama Kurume Azalea ( Rhododendron ) Oudemansii Douglas Fir ( Pseudotsuga menziesii )
Ougon-Kou Chiku Bamboo ( Phyllostachys sulphurea ) Our Indian Begonia ( Begonia Our Indian )
Our Sacha Rose ( Rosa ) Our Ted Fuchsia ( Fuchsia )
Our Vanilla Rose ( Rosa ) Outback Sunset Dense-Flowered Loosestrife ( Lysimachia congestiflora )
Outpost Canadian Hemlock ( Tsuga canadensis ) Outrageous Daylily ( Hemerocallis hybrida )
Ouvrardii Cretan Brake ( Pteris cretica ) Ovalifolia Japanese Spiraea ( Spiraea japonica )
Ovata ( Strelitzia reginae ) Ovation Fuchsia ( Fuchsia )
Overcup Oak ( Quercus lyrata ) Overeynderi English Yew ( Taxus baccata )
Overeynderi False Cypress ( Chamaecyparis lawsoniana ) Owatarii Pseudosasa ( Pseudosasa owatarii )
Owens Pfitzer Chinese Juniper ( Juniperus chinensis ) Ox-eye Daisy ( Chrysanthemum leucanthemum )
Oxford Blue ( Nigella damascena ) Oxford Blue Annual Clary Sage ( Salvia viridis )
Oxford Tulip ( Tulipa ) Oxfords Elite Tulip ( Tulipa )
Oxlip Primrose ( Primula elatior ) Oxydol Exbury Azalea ( Rhododendron )
Oxypetalum Lily ( Lilium oxypetalum ) Oxyphylla Begonia ( Begonia oxyphylla )
Oyama Magnolia ( Magnolia sieboldii ) Oyez Arilbred Bearded Iris ( Iris )
Oyster Bay ( Ilex opaca ) Ozakazuki Japanese Maple ( Acer palmatum )
Ozark Beauty Peony ( Paeonia lactiflora ) Ozark Compact Pfitzer Juniper ( Juniperus chinensis )
Ozark Gold Apple ( Malus domestica ) Ozark Phlox ( Phlox pilosa )
Ozark Premier ( Prunus salicina ) Ozark Queen Hardy Water Lily ( Nymphaea )
Ozark Spring Crapemyrtle ( Lagerstroemia indica ) Ozark Sundrops ( Oenothera macrocarpa )
Ozeki Camellia ( Camellia japonica ) Ozora Kurume Azalea ( Rhododendron )


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