BNCYOLOPADIA OF GARDENING. 
annually. Propagate by spores gathered just before the cases burst & 
sown ci surface of wel Faeeued pan of sandy peat & leaf-mould with 
square of glass, & kept moderately moist in shady position in cold 
frame or greenhouse ; iyision of plants, March or April. ; 
SPECIES CULTIVATED: O. germanica (Syn. Struthiopteris germanica), the 
Ostrich Fern, 2 to 3 ft., N. Temperate Zone; sensibilis (Sensitive Fern), 2 to 3 ft., 
N. America and N. Asia. 
Ononis (Rest-harrow).—Ord. Leguminose. Hardy herbaceous 
perennials & deciduous shrubs. First introduced 1570. 
CULTURE OF PERENNIAL SPECIES: Soil, ordinary. Position, 
sunny borders, banks or rockeries. Plant, Oct., Nov., March or April. 
Cut down flower stems, Oct. Mulch with manure, March. Lift & 
replant in fresh soil every four or five years. 
CULTURE OF SHRUBBY SPECIES: Soil, ordinary. Position, 
sunny borders or banks. Plant, Oct, to Feb. Prune into shape, Jan. 
to Feb. Propagate by seeds sown 1-16in. deep in ordinary soil in 
semi-shady position outdoors, March or April; or in shallow boxes or 
pans in cold frame or greenhouse in March; perennials by division of 
roots, Oct. to March. 
PERENNIAL SPECIES: O. arvensis (Rest-harrow), rose and white, summer, 
‘ ans Sunes (Britain); Natrix (Goat Root), yellow and red, summer, 1 to 2 ft., 
SHRUBBY SPECIES: O. fruticosa, purple, summer, 2 ft., Europe. 
Onoporden (Cotton Thistle; Scotch Thistle)—Ord. Composite. 
Hardy biennial & perennial herbs. Orn. foliage. 
CULTURE OF BIENNIAL SPECIES: Sow seeds }in. deep in ordi- 
nary soil in sunny position outdoors, March or April. Transplant seed- 
lings following Sept. to where required to flower. 
CULTURE OF P RENNIAL SPECIES: Soil, ordinary rich. Posi- 
tion, well-drained sunny borders. Plant, Oct. or March, singly in 
groups of three. Propagate by seeds sown 3 in. deep in ordinary soil 
in sunny position outdoors March or April, transplanting seedlings 
to flowering position Sept. or Oct. 
5 es a PECIES: O. arabicum, 8 to-10 ft., S. Europe; illyricum, 6 ft., 
PERENNIAL SPECIES: O. Acanthium ae Thistle), 5 ft., Europe (Britain). 
Onosma (Golden Drop)—Ord. Boraginacew. Hardy perennial 
herbs. First introduced 1683. 
CULTURE: Soil, two parts sandy loam, one part grit or small stones. 
Position, sunny rockery, where roots can descend close to cool moist 
stones and shoots trail over edge. Plant, March or April. Place a few 
small stones on surface of soil around plant. Water occasionally in 
dry weather. Mulch annually with decayed cow manure in March 
or April. Propagate by seeds sown 1-16 in. deep in sandy loam & grit in 
shallow pans in shady cold frame or cool greenhouse in March, planting 
outdoors in May ; cuttings of shoots inserted in sandy soil in close shady 
frame or under hand-light in July or Aug. 
SPECIES OULTIVATED: 0. albo-roseum, white and rose, summer, 6 in., Asia 
Tr 
Minor; Bourgsi, yellow, summer, 6 in., Armenia; echioid 1 ) 
May, 1 ft., Europe; stellulatum, yellow and white, May, Gin mews aes 
Onychium.—Ord. Filices. Stove & greenhou 
Fronds, four times divided, light and graceful, peecay. oe 
_ CULTURE: Compost, two parts peat and loam, leaf-mould & sand 
in equal parts. Position, well-drained pots, beds, or rockeries in shade. 
Pot or plant, Feb. or March. Water copiously March to Sept., mode- 
rately afterwards. Moist atmosphere essential. Temp. for stove 
species, March to Sept. 65° to 75°, Sept. to March 55° to 65; for green- 
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