lli; Principles of Plant CuUuve. 



ficient to complete ;uul fully mature its normal amount 

 of growtli. ^"arieties of the apple and other trees, that 

 so far complete their giowth in anj' given locality that 

 their leaxes fall before hard fi-osts. are rarely injured in 

 winter, while those tliat continue g]-owth until their 

 foliage is desti-oyed by freezing suffer in severe winters. 

 Deciduous trees are liable to destruction in severe win- 

 ters in a climate where none of the leases fall before 

 hard frosts, as is the case with the peach, apricot and 

 nectarine in northern United States. 



176. Individual Plants Cannot Adjust Themselves to a 

 New Environment, exceiit to a slight extent. The power 

 to complete the annual growth ])rocesses and become 

 sufficiently dormant to enduic the ligor of the rest period 

 in any given lucality is inherited, and not acquired. "We 

 are, therefore, able to do very little toward inuring or 

 ucd'nnatiiinf) (ac-cli'-ma-tiz-ing) indi\idual plants to an 

 environment to which they were not adapted by nature. 

 We may, liowc\'er, thr(jugh the variations of offspring 

 (18), Secure varieties in some cases that can endure an 

 envii'onnient which the jiarents could not endure. 



177. Plant Processes during the Rest Period may not 

 entiiely cease. Although food preparation is wholly 

 suspended, root growth and the callusing (T.'i) of injured 

 i-oot surfaces proceed to some extent during the winter in 

 unfrozen layers of soil; and in sufficiently mild weather, 

 the resei\e food in the stem gradually moves in the direc- 

 tion of the terminal buils. 



178. Cuttings (.35S) of Woody Plants are Preferably Made 

 in Autumn in climates of severe winters and buried in the 

 ground Ix'low the limit of hard freezing, in order that 



