194 WATER-LILIES 



formal gardens, the thuyas give more satis- 

 factory results in hedges or groups. 



For light, sandy and well-drained soil, pines 

 form the best windbreaks. Among them the 

 Austrian pine {Pinus Laricio, var. Austriaca) 

 is especially recommended as it will flourish 

 under the most adverse circumstances and 

 survives in cities where others die from the 

 influence of smoke. It becomes a tree lOO 

 feet high. The Swiss stone pine {Pinus 

 Cembra), with a very dense growth and ordi- 

 narily attaining a height of seventy feet is 

 quite hardy and very handsome. 



The Bhotan pine (P. excelsd) is, in a shelt- 

 ered position, hardy as far north as Massa- 

 chusetts and may attain a height of 150 feet. 

 It is of special value as a windbreak because it 

 retains its lower branches. The drooping 

 leaves, six to eight inches long, with their 

 blue-grey sheen, make the trees particularly 

 attractive, not only when planted singly but 

 also when grouped. 



The Korean pine {Pinus Koraiensis), be- 

 cause of its slow growth, is recommended as 



