TEXTBOOK OF LANDSCAPE GARDENING 
Fig, 121. Wirse-Rop, Viburnum cassinoides 
Weigelia (Diervilla): Hardy flowering shrubs and generally 
useful. 
Willows: There are many shrubby species of willows which 
can be effectively employed in landscape planting. Many of these 
are most effective in shrubbery plantings when cut back every year 
or two and allowed to sprout from the ground. 
Study 
It is essential that the pupil give extended and faithful study to 
this interesting and endless subject. Acquaintance should be made 
with all the shrubs cultivated in the vicinity, and they should be 
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