370 THE COMPLETE GARDEN 



root system of a potted plant has filled the pot the plant is root-bound, 

 or when the root system of stock planted in pockets has filled the 

 pocket and the surrounding soil is so compact that the roots cannot 

 penetrate it, the plant becomes root-bound. 



Root Prune: 



To prune or cut the roots of a plant in order to check excessive growth 

 of the woody tops; often done to secure a compact root system consist- 

 ing of a mass of fine roots confined to a limited area in order to permit 

 of the plant being transplanted with a greater degree of certainty that 

 the plant will continue to live (See Plate VI, Page 34). Some- 

 times done merely to permit of the plant being more easily fed and 

 decrease the probabiHty of the plant food being lost in the greater 

 area of soil, or taken up by plants for which it is not intended. 



Root Stock: 



The subterranean runner or partially subterranean runner which is a 

 part of the root system (not a part of the stem) which roots at inter- 

 vals and sends up stems similar to a stolon. It is a part of the true 

 root system, while a stolon is part of the stem. 



Rotted Manure: 



Organic manure in which oxidation is so nearly completed that no 

 appreciable amount of heat is given off and much of the material is 

 available as plant food. 



Runner: 



A slender stolon. (See Root Stock). 



Rust: 



A diseased condition caused by a rust fungus. 



Sanctuary: 



A place of refuge in which birds or animals may continue their normal 

 habits without fear of being molested. 



Scald: 



A diseased condition of the bark of a woody plant caused either by the 

 action of frost in bursting the cells or by excessive drying due to sun or 

 wind action. 



Scion: 



Any bud or shoot or other portion of the stem of a plant capable of 

 propagation cut off and prepared for grafting. 



