182 Landscape Gardening 



and it has been suggested that by spraying the trunk and 

 main branches with arsenate of lead and water or with this 

 substance in the Bordeaux mixture, in the spring and early 

 summer, this injury may be prevented. 



Willows. — Like the poplars, the willows are easily prop- 

 agated by cuttings and will grow in almost any soil. They 

 grow very rapidly, but soon reach maturity and are not 

 of much value for permanent growth. Some of the weeping 

 varieties are graceful and very ornamental and will be 

 described under the head of Weeping Trees. 



White Willow (Salix alba). — The most rapid grower of 

 all of the willows and often used to hold embankments and 

 the soil along the borders of ponds and streams in place. 

 While young it is regular in form and ornamental, but as it 

 becomes older takes a more irregular growth and loses much 

 of its beauty. 



Golden Willow {S. vitellina). — Of the same form and 

 habit of the white willow and possessing the same faults, 

 but its golden bark in winter often forms a beautiful 

 feature when planted among canoe-birches, red-twigged 

 willows, or red dogwoods. 



Red-twigged Willow {S. vitellina, var. Britzensis). — ^This 

 is a comparatively new variety with red twigs which while 

 young are nearly as red as those of the red dogwood. 



Basswood or American Linden {Tilia americana). 

 — ^A native tree of some value for ornamental purposes. It 

 has large, dark green foliage and very fragrant white flowers 

 suspended on long-winged peduncles in July. It makes a 

 large tree in good soil, but becomes rather irregular as it 

 reaches full growth. 



European Lindens {T. plutyphyllos and vulgaris). — Native 

 of middle and northern Europe, of more regular form and 

 smaller foliage than the last, and but for the injury caused 

 by borers and a leaf-blight they would be most valu- 



