Œnothera, including Godetia (Evening Primrose). Onagrameæ.
Seeds may be sown in spring or summer. Divisions may be made. Cuttings of perennials should be placed in a cool frame in the early part of the season before flowering begins.
Okra, Gumbo (Hibiscus esculentus). Malvaceæ.
Seeds, sown where the plants are to stand, or started in pots often in the north.
Olax. Olacineæ.
Grown from cuttings of firm or mature shoots in heat.
Olea. Oleaceæ.
The ornamental species are grown from cuttings of ripened shoots, either under frames or in the border, and also by seeds. For propagation of O. Europæa, see Olive.
Oleander. See [Nerium].