58 PLANT GROWTH 



The growth of the buds depends on the stored food sup- 

 ply. It is a common nursery practice to cut some woody 

 plants off just at the ground level when they are two to four 

 years old and grow a single shoot from the cut stump. The 

 excess food in the root will cause this shoot to grow as tall 

 as the plant had been, and it will be a straighter, more desira- 

 ble plant. The great problem is to know when the plant is 

 storing enough food and when it must be encouraged to 

 store more. 



REFERENCES 



Gray, Asa, Elements of Botany, American Book Co., 1887. 



Smith, G. M., J. B. Overton, E. M. Gilbert, R. H. Denniston, G. S. Bryan, and C. E. 

 Allen, A Textbook of General Botany, The Macmillan Co., 1935. 



