8o Weeds. 



not given to the work of keeping them quite 

 clean, their growth only serves to encour- 

 age the increase of weeds in general, and 

 of creeping perennials in particular. Their 

 cultivation furnishes conditions very favor- 

 able to the lateral extension of. the root- 

 stocks of creeping perennials. It is also 

 equally favorable to the development in 

 robust vigor of annuals ; so that it not infre- 

 quently happens that where a cultivated 

 crop is grown, and sufficient care is not 

 taken with it, these annual weeds perfect 

 their seeds in great numbers, thus making 

 the state of the field at the end of the sea- 

 son, so far as weed seeds are concerned, 

 worse than it was at the beginning. Where 

 cultivated crops cannot be grown success- 

 fully, that is, so far as weed destruction is 

 concerned, a modified form of the bare fal- 

 low, as described farther on in this chap- 

 ter, may take their place. 



8. Grozv clover and alfalfa. Where the 

 conditions are favorable to their growth, 

 the raising of crops of clover and alfalfa 

 will be found helpful in the reduction of 

 weeds ; and more especially is this true of 

 the common red clover. These crops are 

 not only valuable in weed destruction 



