Orcutt Aster Oregano (spp.)
Oregano Golden Oregano 'Thumbles'
Oregano Variegated Oregano, Cuban (spp.)
Oregano, Ornamental 'Herrenhausen' Oregano, Ornamental 'Rosenkuppel'
Oregano, Roundleaf Oregon Cedar (spp.)
Oregon Cedar 'Aurea Densa' Oregon Cedar 'Columnaris'
Oregon Cedar 'Erecta' Oregon Cedar 'Fletcheri'
Oregon Cedar 'Globosa Nana' Oregon Cedar Golden
Oregon Cedar Golden Oregon Cedar 'Green Pillar'
Oregon Cedar 'Intertexta' Oregon Cedar 'Lane'
Oregon Cedar 'Lane's Aurea' Oregon Cedar 'Minima Aurea'
Oregon Cedar 'Pembury Blue' Oregon Cedar 'Pottenii'
Oregon Cedar 'Triomf van Boskoop' Oregon Cedar 'Wisselii'
Oregon Cedar 'Yvonne' Oregon Fleabane 'Dignity'
Oregon Fleabane 'Prosperity' Oregon Grape 'Skylark'
Oregon Grape (spp.) Oregon Grape 'Apollo'
Oregon Grape 'Compactum' Oregon Holly Grape (spp.)
Oregon Holly Grape 'Apollo' Oregon Holly Grape 'Compactum'
Oregon Holly (spp.) Oregon Holly 'Apollo'
Oregon Holly 'Compactum' 'Oregon Jade' Mugo Pine
Oregon Lily Oregon Maple
Oregon White Oak Organ Pipe Cactus
Organ Pipe Cactus: thurberi 'Orido Nishiki' Japanese Maple
'Oridono nishiki' Japanese Maple Oriental Alder
Oriental Arborvitae (spp.) Oriental Bittersweet
Oriental Cherry (spp.) Oriental Cherry 'Kiku-Shidari'
Oriental Cherry 'Kwanzan' Oriental Cherry 'Ojochin'
Oriental Cherry 'Royal Burgundy' Oriental Cherry 'Shiro-Fugen'
Oriental Cherry 'Tia Haku' Oriental Chives
Oriental Fountain Grass (spp.) Oriental Lily (spp.)
Oriental Lily 'Rubrum' 'Oriental Limelight' Mugwort: vulgaris
Oriental Oak Oriental Paper Bush (spp.)
Oriental Paper Bush 'John Bryant' Oriental Paper Bush 'Winter Gold'
Oriental Pear Oriental Photinia
Oriental Planetree (spp.) Oriental Planetree 'Insularis'
Oriental Poppy (spp.) Oriental Poppy 'Allegro'
Oriental Poppy 'Beauty of Livermore' Oriental Poppy 'Brilliant'
Oriental Poppy 'China Boy' Oriental Poppy 'Garden Glory'
Oriental Poppy 'Karine' Oriental Poppy 'Pink Ruffles'
Oriental Poppy 'Pinnacle' Oriental Poppy 'Pizzicato'
Oriental Poppy 'Princess Victoria Louise' Oriental Poppy 'Queen Alexander'
Oriental Poppy 'Raspberry Queen' Oriental Poppy 'Royal Wedding'
Oriental Poppy 'Turkenlouis' 'Oriental Ruby' Daylily
Oriental Spice Bush Oriental Spruce (spp.)
Oriental Spruce Golden Oriental Spruce 'Nigra Compacta'
Oriental Spruce 'Rara Flora Fluke' Oriental Spruce 'Skagit'
Oriental Spruce 'Skylands' Oriental Sweetgum
Oriental Sycamore (spp.) Oriental Sycamore 'Insularis'
'Orientale' Chinese Fountain Grass 'Origami Blue and White' Columbine
'Orkneys Pink' Hybrid Geranium