O
| Family | Name | Nativity |
|---|---|---|
| Ochnaceae | Ochna serrulata | South Africa |
| Oleaceae | Fraxinus sp. | |
| Jasminum mesnyi | W China | |
| Ligustrum japonicum | Japan, Korea | |
| Olea europaea | Mediterranean | |
| Olea europaea cv. Manzanillo | ||
| Olea exasperata | South Africa | |
| Osmanthus fragrans | E Asia | |
| Osmanthus heterophylla cv. Argenteo-marginata | ||
| Phillyrea latifolia | ||
| Oleandraceae | Arthropteris tenella | Australia, New Zealand |
| Nephrolepis cv. Compacta | ||
| Nephrolepis exaltata | Tropics | |
| Nephrolepis exaltata cv. Tessellata | ||
| Onagraceae | Fuchsia magellanica cv. Versicolor | |
| Gaura lindheimeri | Texas, Louisiana | |
| Hauya elegans v. hauya | Mexico | |
| Hauya sp. | ||
| Ludwigia peploides | N & S America | |
| Ludwigia repens | North America | |
| Ludwigia sedoides | ||
| Oenothera sp. | ||
| Oenothera speciosa | SW United States, Mexico | |
| Orchidaceae | Angraecum suberbum | Madagascar |
| Brassocattleya lindleyi | ||
| Cattleya cv. Sue Ozella | ||
| Cymbidium iridiodes | IndoChina | |
| Epidendrum ibaguense | Cen & South America | |
| Epidendrum sp. | ||
| Epidendrum x obrienianum | ||
| Laelia anceps | Mexico | |
| Laelia rubescens | Mexico, Cen America | |
| Laeliocattleya cv. Callistoglossa | ||
| Laeliocattleya cv. Elizabeth 'Sparkling Burgundy' | ||
| Oncidium sp. | ||
| Oncidium splendidum | Guatemala | |
| Phaius tankervilliae | Himalaya to Australia | |
| Stanhopea wardii | Mexico | |
| Osmundaceae | Todea barbara | Aust., New Zealand, S. Africa |
| Oxalidaceae | Oxalis carnosa | Bolivia, Chile, Peru,Galapagos |
| Oxalis gigantea | Chile |


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Ganna Walska died March 2, 1984, at Lotusland, leaving her garden and her entire estate to the Ganna Walska Lotusland Foundation, to insure that her legacy would remain in her gardens.