| Add to Export List | Image | Common Name | Scientific Name | Cultivar/Variety | Plant Type |
|---|---|---|---|---|---|
| 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 Limelight Artemisia | Artemisia vulgaris | 'Oriental Limelight' | Annual | |
| 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 xacutiflora | '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 | ||
| Add To List Remove From List | Pacific Giant Astolat Delphinium | Delphinium | 'Astolat' | Hardy perennial | |
| Add To List Remove From List | Pacific Giant Delphinium | Delphinium | 'Pacific Giants' | Hardy perennial | |
| Add To List Remove From List | Pacific Hybrids Primrose | Primula | 'Pacific Hybrids' | Hardy perennial | |
| Add To List Remove From List | Pacific Sunset® Maple | Acer truncatum × A. platanoides | 'Warrenred' | Deciduous tree | |
| Add To List Remove From List | Pagoda Dogwood | Cornus alternifolia | Deciduous shrub | ||
| Add To List Remove From List | Paint the Town Garden Path | Rosa | 'BAItown' | Deciduous shrub | |
| Add To List Remove From List | Painted Daisy | Tanacetum coccineum | Hardy perennial | ||
| Add To List Remove From List | Painted Paradise New Guinea Impatiens | Impatiens New Guinea xhybrida | 'Kiadime' | Annual | |
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