126 



CROPS AND WEEDS 



Annuals. Some weeds grow up, blossom, ripen their 

 seeds, and perish, all in one season. These are called 

 annual weeds. Weeds of this class are usually easy to 

 destroy, for, if we pull them up or cut them off at the 

 surface or a little below it, they do not often grow again. 

 Many of the most common garden weeds belong to this 



FIG. 66. Corn choked by weeds. 



class. Annual weeds usually seed more freely than other 

 kinds. 



Biennials. Weeds of another class grow in part one 

 season and live through winter, to blossom, ripen their 

 seed, and die, the next season. These are called biennial 

 weeds. The well-known "bull thistle," so common in 



