Norfolk Island Pine
Nova Agave
Ocotillo
Octopus Agave
Old Man Cactus
Oleander
Olive, European Olive
Opal Alum Root Hybrid
Orange Clock Vine
Orange Conebush
Orange Ice Plant
Orange Sedge
Orchid Annie Butterfly Bush
Orchid or Purple Rockrose
Oregon Grape
Oriental Fountain Grass
Ornamental Onion
Otto Quast Spanish Lavender
Our Lord's Candle