ENCYCLOPEDIA OF GARDENING. 
SPECIES CULTIVATED: 0. europea (Wild Olive), white, fragrant, summer, 
6 to 10 ft., S. Europe. 
Oleander (Nerium oleander)—See Nerium. 
Oleander Fern (Oleandra articulata).—See Oleandra. 
Oleandra (Oleander Fern).—Ord. Filices. Stove evergreen ferns. 
Stems rhizomatous & scandent. Fronds, strap-shaped, green. First 
introduced 1837. 
CULTURE: Compost, two parts peat & one of loam, leaf-mould & 
sand. Position, hanging baskets, or against pillars and walls covered 
with layer of peaty soil secured by wire netting. Plant, Feb. or March. 
Water copiously March to Sept., moderately afterwards. Syringe 
plants or pillars & walls daily, March to Oct. Temp., March to Sept., 
65° to 75°; Sept. to March 55° to 65°. Propagate by spores sown on 
surface of fine sandy peat under bell-glass in temp. 75° to 85°, any 
time; division of precne rhizomes at potting time. 
SPECIES CULTIVATED: O. articulata, Trop. Africa; nodosa, W. Indies. 
Olearia (New Zealand Daisy Bush; Victorian Snow Bush).—Ord. 
Composite. Hardy evergreen flowering shrubs. First introduced 1793, 
OUTDOOR CULTURE: Soil, sandy loam. Position, sunny borders 
or rockeries for O. Haastii, S. or W. walls for O. dentata, O. gunniana 
& O. Forsteri. Plant Sept. to Nov. or April. Protect those grown 
against walls during very severe weather by covering of mats or straw. 
Pruning not required, except to remove dead or unhealthy shoots in 
April. Not adapted for outdoor culture in N. of England. 
POT CULTURE: Compost, two parts sandy loam, one part leaf- 
mould or peat, one part sand. Position, well-drained pots or in beds 
with shoots trained up pillars or against walls in cold greenhouses or 
conservatories. Pot or plant, Sept, to April. Water freely March to 
Sept., moderately afterwards. Syringe freely in summer, except when 
in bloom. Place pot plants in sunny position outdoors until they 
flower. Plunge pots to rim in cinder ashes. Propagate by cuttings 
of firm young shoots 2 to 3 in. long, inserted in well-drained pots of 
sandy soil under bell-glass in cold shady frame or greenhouse in 
summer. 
SPECIES CULTIVATED: O. Haastii (New Zealand Daisy Bush), white, Ang., 
4 to 6 ft., New Zealand; macro-donta (Syn. dentata), white, summer, 6 ft., New 
Zealand; stellulata (Victorian Snow Bush), Syn. gunniana, white, summer, 6 ft., 
Australia; Traversii, white, summer, 10 to 20 ft., New Zealand. 
Oleaster (Olea europwa).—See Olea. 
Olive-tree (Olea europeza).—See Olea. 
Olympian Mullein (Verbascum olympicum).—See Verbascum. 
Omphalodes (Venus’s Navel-wort; Rock Forget-me-not; Creep- 
ing Forget-me-not).—Ord. Boraginacew. Hardy annual & perennial 
herbs. First introduced 1633. 
CULTURE OF ANNUAL SPECIES: Soil, ordinary. Position, par- 
tially shaded borders. Sow seeds in masses where required to grow in 
April to flower in June, June to flower in Sept., & Sept. to flower in 
spring. 
CULTURE OF PERENNIAL SPECIES: Soil, ordinary rich, moist. 
Position, partially shaded, well-drained borders or rockeries, or in 
rhododendron beds. Plant, Oct., Nov., March or April. Water copiously 
in dry weather. Mulch with decayed cow manure annually in spring. 
Propagate by secds sown fin. deep in light rich soil in semi-shaded 
position in April, transplanting seedlings when lin. high; division of 
roots in March or April. 
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