§ TREE PLANTING AND PROTECTION 



easily propagated. The Carolina poplar should be se- 

 lected from the male tree, as the female tree is sometimes 

 troublesome because of its downy seeds. The elms are 

 very desirable as street trees, having stout, round trunks 

 and good foliage. The Scotch, the cork, and American 

 elms are all desirable, but the cork elm has made Stock- 

 ton and Sacramento peculiarly beautiful, and many other 

 Northern cities are adopting this particular species. The 

 Oriental plane, the Italian chestnut, the English hawthorn, 

 the linden and both walnuts, California and English, are 

 all popular. In the interior towns the Texas umbrella and 

 the locust are desirable. 



Very much of the planting of trees in Southern Cali- 

 fornia is as yet experimental, and only in the older com- 

 munities is there much, if any, precedent established to guide 

 one. Then, too, because we have valley and mountain, sea- 

 side and desert to be considered in our territory, local condi- 

 tions must always be considered, and no positive or set rules, 

 except those which common sense would dictate, can be uni- 

 versally applied; so that, in considering the question of irri- 

 gation, I would say that the only way one can know how 

 often and how much water should be given trees, is by ob- 

 servation and exercise of judgment. 



Less water is required in winter than summer; less water 

 is required near the sea than in interior valleys. Loose, open 

 soil requires less than clay or adobe. Generally speaking, 

 young trees should at first have water at least every two 

 weeks, and great care should be exercised never to allow a 



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