438 MANUAL OF GARDENING 
boundary plant, or to serve the purpose of a screen. These dwart 
trees should be set deep — 4 to 6 inches below the union — to prevent 
es . 
282. Duchesse d’Angouléme pear. 
the stock from growing. Dwarf trees may be set as near together as 10 
to 16 feet (p. 410), while the standard or tall-growing pears should be 
set 18 to 25 feet apart. Trees are planted when two or three years old. 
283. The Kieffer pear. 
The pear thrives on clay soil, if well under-drained, and for this 
reason may succeed in places where other fruits might fail. A good, 
steady growth should be maintained, but the use of nitrogenous 
