328 THE NURSERY-MANUAL 



must be taken not to disturb the cion. If everything does well, 

 there will be three or four canes from the upper buds, which may be 

 pruned just as any other bearing vines." 



Grapefruit, Pomelo, Shaddock (Citrus grandis). Rutacece. 



Propagated by budding on seedlings of sour orange, rough lemon 

 and grapefruit, also on Poncirus trifoliata. See Orange. 



Grasses, agricultural. 



The grasses of meadows and pastures are mostly perennial. 

 They are propagated by seeds, usually sown in the cool of the 

 year as in spring in wheat fields or other grain. Usual quantities 

 of seed to the acre are as follows : timothy, 15 to 25 pounds ; blue- 

 grass (June-grass), 25 pounds; brome-grass, 12 to 20 pounds; 

 johnson-grass, 1 to 1^ bushels; orchard-grass, 12 to 15 pounds; 

 sheep fescue, 2-J- to 3 bushels ; rye-grass, 2 to 3 bushels ; redtop, 12 to 

 15 pounds. Many combinations of these and other grasses are used. 



Grasses, ornamental. 



The perennial ornamental grasses are in most cases increased 

 by seed or division. It is usually best to propagate varieties with 

 variegated foliage by division, although some of the variegated forms 

 of Zea Mays come true from seeds. Arundo Donax variegata is 

 increased by division, as it rarely seeds (at least North). The 

 annual ornamental grasses are raised readily from seeds. 



Grevillea. Proteaceae. 



Grown from seeds, sown under glass in late winter ; also by 

 cuttings of half -ripened wood. The common silk oak of green- 

 houses (G. robusta) is raised extensively from seeds ; it is attractive 

 only in its young stage, and new plants are raised frequently. 

 Most of the species graft readily on G. robusta. 



Grindelia. Composites. 



Propagated by seeds, sown in the open or under glass, by divisions 

 and by cuttings. 



Guava (Psidium, several species). Myrtacece. 



The guavas grow readily from seeds, and plants often bloom 

 when a year and a half old. They may also be multiplied by layers, 

 and by cuttings either under glass or in the open. Grafting and 

 budding have also been practiced. The usual method is by seed, 

 but as named horticultural varieties become more prominent, rapid 

 vegetative means of propagation must be perfected. 



