| Add to Export List | Image | Common Name | Scientific Name | Cultivar/Variety | Plant Type |
|---|---|---|---|---|---|
| Add To List Remove From List | October Skies Aster | Symphyotrichum oblongifolium | 'October Skies' | Hardy perennial | |
| Add To List Remove From List | Ohio Buckeye | Aesculus glabra | Deciduous tree | ||
| Add To List Remove From List | Old Gold Juniper | Juniperus chinensis | 'Old Gold' | Evergreen shrub | |
| Add To List Remove From List | Old Yella Hibiscus | Hibiscus | 'Old Yella' | Hardy perennial | |
| Add To List Remove From List | Olive Bailey Langdon Hosta | Hosta | 'Olive Bailey Langdon' | Hardy perennial | |
| Add To List Remove From List | On Parade Bee Balm | Monarda | 'On Parade' | Hardy perennial | |
| Add To List Remove From List | On Stage Hosta | Hosta | 'On Stage' | Hardy perennial | |
| Add To List Remove From List | Onondaga Viburnum | Viburnum sargentii | 'Onondaga' | Deciduous shrub | |
| Add To List Remove From List | Orange Globe Globeflower | Trollius x cultorum | 'Orange Globe' | Hardy perennial | |
| Add To List Remove From List | Orange gnome maltese cross | Lychnis arkwrightii | 'Orange Gnome' | Hardy perennial | |
| Add To List Remove From List | Orange Meadowbrite™ Coneflower | Echinacea | 'Art' | Hardy perennial | |
| Add To List Remove From List | Orange Mint | Mentha xpiperita | 'Citrata' | Hardy perennial | |
| Add To List Remove From List | Orange Perfection Phlox | Phlox paniculata | 'Orange Perfection' | Hardy perennial | |
| Add To List Remove From List | Orange Sedum | Sedum kamtschaticum var. ellacombianum | Hardy perennial | ||
| Add To List Remove From List | Orchid Frost Spotted Deadnettle | Lamium maculatum | 'Orchid Frost' | Hardy perennial | |
| Add To List Remove From List | Orchid Lights Azalea | Rhododendron | 'Orchid Lights' | Deciduous shrub | |
| Add To List Remove From List | Oregano | Origanum vulgare | Tender perennial | ||
| Add To List Remove From List | Oriental Ruby Daylily | Hemerocallis | 'Oriental Ruby' | Hardy perennial | |
| Add To List Remove From List | Orion Geranium | Geranium | 'Orion' | Ground cover, Hardy perennial | |
| Add To List Remove From List | Ornamental Millet | Millet | 'Purple Majesty' | Annual | |
| Add To List Remove From List | Ornamental Onion | Allium senescens | 'Glaucum' | Hardy perennial | |
| Add To List Remove From List | Ornamental Oregano | Origanum laevigatum | Hardy perennial | ||
| Add To List Remove From List | Ornamental Praire Onion | Allium stellatum | Hardy perennial | ||
| Add To List Remove From List | Ostrich Fern | Matteuccia struthiopteris | Fern, Hardy perennial | ||
| Add To List Remove From List | Ostrich Plume Astilbe | Astilbe | 'Straussenfeder' | Hardy perennial | |
| Add To List Remove From List | Othello Ligularia | Ligularia dentata | 'Othello' | Hardy perennial | |
| Add To List Remove From List | Oval-Leaved Milkweed | Asclepias ovalifolia | Hardy perennial | ||
| Add To List Remove From List | Overdam Feather Reed Grass | Calamagrostis x acutiflora | 'Overdam' | Hardy perennial, Ornamental grass | |
| Add To List Remove From List | Ox Eye Sunflower | Heliopsis helianthoides var. scabra | Hardy perennial | ||
| Add To List Remove From List | Oxalis | Oxalis purpurea | Tender bulb | ||
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