3l6 VEGETABLE GARDENING 



plants to grow when the leaf stalks are in darkness or 

 subdued light. Growth under such conditions destroys 

 the coloring matter of the leaf stems and prevents the 

 formation of additional coloring matter. Any means of 

 protecting the plants from light while they are growing 

 will, therefore, secure light-colored stalks. Blanching 



FIG. 77. CELERY HILLER 



also makes the stalks tender and crisp and improves 

 the flavor. 



For many years, earth has been used most extensively 

 for blanching. When blanched with soil the stalks pos- 

 sess a sweet, nutty flavor that cannot be obtained by any 

 other method. Earth must not be used in warm weather 

 because it causes rust, hence banking does not begin 



