MORE ABOUT WEEDS 



135 



should be carefully prevented from seeding, not only in 

 cultivated grounds, but in waste places as well, and this 

 is the only means by which it may be prevented from 

 becoming troublesome. It is often necessary to go 

 through corn and stubble fields in August or September 

 for this purpose. 



The Sow Thistle ( called, also : Field sow thistle, Per- 

 ennial sow thistle), Sonchus aruensis. This plant is al- 

 most as bad as the 

 Canada thistle. 

 Indeed, some 

 farmers who have 

 contended with 

 both of these ene- 

 mies have pro- 

 nounced the sow 

 thistle the more 

 unmanageable of 

 the two. 



The plant of the 

 sow thistle is soft- 

 er and less rigid 

 than that of either 

 the Canada thistle 

 or the bull thistle. 

 The leaves are 

 thinner and 

 smoother, and, 

 while having FlG> "- Sow thistle in blootn ' 



prickles on their borders, are so soft and flabby that they 

 may be easily handled. The stem, which is free from 



