KEY To PLATE XIII 



FIG. 57. A few heads of lettuce planted among the 

 plants of asparagus will not injure the asparagus, 

 the lettuce plants are shaded from the hot sun and 

 are very tender. 



FIG. 58. A, Asparagus in the right condition for cut- 

 ting. B, Stalks too old for cutting. 



FIG. 59. A thrifty row of rhuharb. The thin stalk 

 shows that the plant lacks nitrogen. Age also pro- 

 duces spindly stalks. The thick stalk was taken 

 from a plant well supplied with moisture and all 

 the food necessary. 



