LAWN BEAUTIFICATION 295 



Mustard, wild radish, and wild lettuce, though 

 annuals, are often difficult to exterminate as they 

 are abundant seed producers. The best method 

 of exterminating these is to destroy each plant 

 before it has time to ripen seed. 



Usually it is possible partially to rid the land 

 of them by plowing it thoroughly early in the 

 spring and growing some cultivated crop. 



Sheep sorrel or redweed, sometimes called 

 "shamrock," is another most persistent weed, 

 very hard to exterminate if once established, 

 especially in lawns and moist shady places. It is 

 a persistent producer of runners, as well as seeds 

 that are projected a great distance when ripe. 



It seeds abundantly when the plants are quite 

 young. As the seeds ripen they are projected 

 with great force in all directions. This is best 

 exterminated by unremitting destruction with 

 the hoe before the plants produce seeds. 



There are numerous other smaller and more 

 insignificant weeds such as shepherd's purse, sev- 

 eral senecios, chickweed, and others which are 

 not as persistent as those already discussed, but 

 which should be kept well under control by 

 thorough cultivation if good crops are to be 

 produced. 



It should be borne in mind that weeds are 

 enormously prolific, and that their seeds go 



