Nipple Cactus Nipple Cactus: muehlenpfordtii
Nipple Cactus: polythele Nippon Daisy
Nippon Lily 'Nippon' Maiden Grass
'Niveum' Young's Barrenwort 'Nob Hill' Daylily
'Nobility' Hosta Nodding Lady's Tresses
Nodding Onion Nolina, Bigelow
'Nonstop® Apricot' Hybrid Tuberous Begonia 'Nonstop®' Hybrid Tuberous Begonia
'Nonstop® Rose Petticoat' Hybrid Tuberous Begonia 'Nonstop® Yellow' Hybrid Tuberous Begonia
'Nora Leigh' Summer Phlox North American Wild Oats
Northern Blue Flag 'Northern Exposure' Hosta
Northern Jacob's Ladder 'Heavenly Habit' 'Northern Lights' Hair Grass
Northern Sea Oats 'Norwich Canary' Montbretia
'Nova' Foxtail Agave 'Nova' Spiral Ginger
Nubian Aloe (spp.) Nubian Aloe Variegated
Nun's Cap Nun's Hooded Orchid
Nut Grass 'Nutmeg' Geranium: Pelargonium
Nutmeg Scented Geranium Nuts, Fox
Nutsedge, Yellow Oak Fern (spp.)
Oak Fern 'Plumosum' Oak Leaf Geranium
Oak Leaf Ivy (spp.) Oak Leaf Ivy 'Ellen Danica'
Oak Leaf Ivy 'Mandaiana' 'Oak Leaf' Velvet Leaf: beharensis
'Oakhurst' Pineapple Lily 'Oakington Blue Eyes' Moss Phlox
'Oakington Jewel' Alumroot: Heuchera 'Oakleaf' Heartleaf Foamflower
Oatgrass, Blue (spp.) Oatgrass, Blue 'Sapphire'
Oats, North American Wild Oats, Northern Sea
Oats, River Oats, Sea
Oats, Spanglegrass River Oats, Wild
Obedient Plant (spp.) Obedient Plant 'Miss Manners'
Obedient Plant 'Mordea Beauty' Obedient Plant 'Pink Bouquet'
Obedient Plant 'Red Beauty' Obedient Plant 'Summer Snow'
Obedient Plant Variegated Oblong Fern
'Obsession Red With Eye' Bedding Verbena Oconee Bells
October Daphne (spp.) October Daphne Dwarf
October Plant (spp.) October Plant Dwarf
Octopus Agave Octopus Plant (spp.)
Octopus Plant Variegated 'Ogon' Dwarf Sweet Flag
'Ogon' Makino Stonecrop Ohio Spiderwort 'Mrs. Loewer'
Oil Grass Okame Zasa
'Old Fashioned Rose' Geranium: Pelargonium 'Old Gold' Rockcress: ferdinandi-coburgi
'Old Gold' Swedish Begonia: Plectranthus Old Maid (spp.)
Old Maid 'First Kiss Blueberry' Old Maid 'Parasol'
Old Maid 'Pastels Mix' Old Maid 'Pretty in Rose'
Old Maid 'Raspberry Cooler' Old Maid 'Rose Carpet'
Old Maid 'Stardust Mix' Old Maid 'Stardust Orchid'
Old Man and Woman 'Mrs. Giuseppi' Old Man Cactus
Old Man of the Mountains Old Man's Whiskers
Old Woman Cactus Old Woman (spp.)
Old Woman 'Silver Brocade' 'Old Yella' Mallow
Oleander Leaved Protea (spp.) Oleander Leaved Protea 'Pink Splash'
Oleander 'Petite Salmon' Olena Ginger