260 COME INTO THE GARDEN 



a wall — that is preferably built against the face 

 of an earth bank to retain this — are planted with 

 such plants as delight to grow under the condi- 

 tions thus provided, offers possibilities that are 

 very welcome where space is at a premium. 

 Such a wall becomes indeed a garden on end — 

 in the vertical plane — where a garden on the 

 horizontal plane may be altogether out of the 

 question. And as with all kinds of rock or stone 

 work, plants of unusual charm because of their 

 unfamillarity and uncommon use, furnish the 

 planting material. 



In the construction of such a wall there is one 

 thing to be kept constantly in mind: there 

 must be what gardeners call clear root run from 

 the earth pockets in the wall into the earth 

 against which it is laid. Such root runs need not 

 be straight of course, but they must be present 

 throughout all portions of the wall and between 

 each stone, practically. All plants will not send 

 their roots back into the main body of earth, to 

 be sure; but a great many — and some of these 

 small, at that — will do so. It is not unusual in- 

 deed for them to reach eighteen or twenty inches 

 with the thread-like filaments that they put forth 

 in the search for creation's everlasting neces- 

 sity — food. Furthermore this contact between 

 the earth pockets and the mass of earth behind 



