330 THE NURSERY-MANUAL 



from forced plants. Layers are commonly employed in this 

 country. 



Halimodendron (Salt Tree). Leguminosce. 



Increased by seeds, layers and cuttings, the layers often rooting 

 tardily; may also be grafted on common laburnum and on pea- 

 tree or caragana. Thin winter cuttings in bottom heat root readily. 



Hamamelis (Witch-hazel). Hamamelidacece. 



All kinds grow from seeds or layers, and the Japan species succeed 

 if grafted on American species in the greenhouse in spring. H. 

 mrginiana may be propagated readily by layers. Seeds usually 

 germinate the second year. 



Hamelia. Rubiacece. 



May be increased by seeds. Cuttings of nearly ripe wood will 

 root in early summer under glass. 



Hardenbergia. Leguminosce. 



For propagation, seeds may be used ; also increased by division. 

 Cuttings of firm young side shoots in spring will grow under glass 

 in a warm frame or pit. 



Harrisia (one of the segregates of Cereus). Cactacece. 

 For propagation, see Cacti, page 261. 



Hatiora. Cactacecr. 



Propagation as for rhipsalis (H. salicornioidcs is usually known 

 as Rhipsalis salicornioides) . See Cacti, page 261. 



Haworthia. Liliaceoe. 



Propagation as for aloe, which see. 



Hedera (Ivy). Araliaceoe. 



Increased by layers and seeds sown soon after ripening, usually 

 not germinating until the second year. The rooted parts of the 

 vine may be severed and treated as independent plants. Cuttings 

 may be made in autumn placed in pots or in the open ground. 

 Named varieties are grafted on the stock of any strong form. The 

 slow-growing bushy kinds may not grow readily from cuttings; 

 cions of them may be grafted on cuttings of freer-growing kinds. 



Hedychium (Garland Flower). ZingiberacecB. 



Increased by dividing the rhizomes in spring, when the plants are 

 repotted. Rarely propagated by seeds. 



