CHE REFERENCE LIBRARY - ZetaTalk

376 THE NURSERY-MANUALOrnithogalum (Star of Bethlehem). Lilinrm.(‘Ic)n~monl~- increased by bulb& or offsets, and by division ; alsoby seeds \vhen they cm be had.Orobus : Lwthyw.Orontium. ~1 wcr7z.Increased I>y division, but seeds may be used if there is lessbask. See ,1 rww, page 239.Osmanthus (Japan Holly). OZ~wrc~.Propagated t)y cuttings of half-ripened wood ik; late ~ILII~~~‘Pundcar glass, or t)y grafting on osmanthus stock, or on privet. Seedsare rarely obtainable and do not gc>rminate until the second year.Osmaronia, Xuttalia. Rosnrfc~.Propaga.tcd Ijy seeds, stratified or sown as soon as ripe ; bydi\.isions ; b>- suckers from the roots.Osmunda (Flowering Fern). Osrnwzdncrnl.11Iostl~~ 1)s tli\.ision ; sometirnes by spores. See Ferns, page 312.Ostrowskia (Giant Il(~llwort). Cnvt/)cr~~ u~Y~~.Propagatc~tl I)>- root- or top-cuttings in spring. Seeds, unless sownfresh, reqriire a long tirnc for gcrminntion and seedlings may notmature undthr three or four years.Ostrya (Hop Hornlwam). Brjt ~lw~ljr.usually grown from seeds sown when ripe or stratified. ,%lsoincreased by layering ; or it can he graftetl. The European speciesis often grafted on the hornbeam (carpinus).Othonna. (‘o/;! posifn.T’mpagatrt! -1)~. pieces of the stein, treatetl as cuttings, or taken(F afkr rooting if plant lies on gro111~1.Ouvirandra : .,l ~~o~~~gr?w.Oxalis. 0.~wbitlw~cr~.Propagated 1)~ seeds, division and cuttings ; the tuberiferow3speck art: increased hy tile w~dergrou:lc2 tuks.Oxydendrum (Sorr&T’ree). I$rica.cm,Increased by seeds, handled as for andromeda and sitnilar things ;also by layers, which often root with difficulty.