PLEACHED OR GREEN ALLEYS 319 



the smaller trees of weeping growth should be 

 more used for this and the allied uses of train- 

 ing for arbours and other shelter places in the 

 garden. 



The common Plane is much used on the conti- 

 nent for green shelters ; the trees are pollarded at 

 at about eight feet high, and the vigorous young 

 growths trained down horizontally to a slight 

 framework. 



It would be interesting to make a green alley 

 with two or perhaps three kinds of plants whose 

 leaf form was of the same structure. For instance, 

 a groundwork of Weeping Ash could soon be 

 trained into shape, and Wistaria would be best to 

 grow all over and through it. The more stiff and 

 woody Ash would supply the eventual solid frame- 

 work, as by the time the Wistaria was making 

 strong growth (for it is very slow to make a be- 

 ginning) the whole would be well in shape, and 

 might dispense with the framing of " carpenters' 

 work" that is necessary for its first shaping. It 

 would be best to plant the Ash zigzag across the 

 path so that the main of the head of each tree 

 might be trained across the path and down to 

 the ground on the opposite side, when it would 

 occupy the space between the two opposite trees. 



It is important to further maintain the distinc- 

 tion between green alley and pergola by using in 

 the green alley only things of a permanent and 

 woody character ; no Roses or Clematis, or any 

 other plants of which portions are apt to die or 



