206 THE PURSER Y-BOOK. 



Hydrangea, Hortensia. Saxifrages. 



The hardy species are usually propagated by green cut- 

 tings in summer, under glass (see Fig. 57). The tender spe- 

 cies are increased by cuttings taken at any time from vigorous 

 young wood, usually in late winter. Layers are occasionally 

 employed, and suckers can be separated from some species. 

 Sometimes the hardy species are forced for purposes of prop- 

 agation by cuttage. H. quercifolia is propagated by little 

 suckers or ' ' root pips. " H. panuulata, grandiflora can easily 

 be propagated from the young wood, taken in June and 

 planted under glass. 

 Hymenocallis. Amaryllidecc. 



Treated the same as Pancratium, which see. 

 Hypericuni, including Androsaemum. Hypericinecv. 



Easily increased by seeds, cuttings, or by strong pieces of 

 the roots of creeping-rooted species. Hard-wooded cuttings 

 taken in fall, are commonly used. 

 Hypoxis. Ainaryllidece. 



Propagation is effected by seeds and offsets. 

 Hyssop (Hyssoptis officinalis}. Labiatce. 



Seeds. Division. 

 Iberis (Candytuft). Crucifercc. 



The annuals and biennials are increased by seeds sown in 

 light sandy soil, in spring or autumn. The sub-shrubby 

 sorts are also increased by seeds sown in spring, but more 

 often by divisions or by cuttings. 

 Idesia. Bixinece. 



Seeds may be sown in spring in gentle heat. Half- 

 ripened cuttings may be made in spring or autumn, and 

 should be inserted in sandy loam, and placed under a bell- 

 glass, in gentle heat. Also by root-cuttings. 

 Ilex, including Prinos (Holly). Jlicinea. 



Seeds, which should be stratified. They are often cleaned 

 of the pulpy coat by maceration. The seeds rarely ger- 

 minate until the second year. Varieties are perpetuated by 

 graftage. The veneer graft, upon potted plants, is usually 

 employed, but other methods may be successful. Budding 

 is sometimes performed. 

 Illicium (Aniseed-tree). Magnoliacccc. 



Seeds. Cattings of young ripened shoots may be made 

 during summer and should be placed in sandy soil, under a 

 glass. 



