WEEDS OF THE FARM AND GARDEN 



NAME OF SEED 



Lepidium <virginicum . 



Lychnis Git hag o 



Anthemis Cotula 



Malva rotundifolia . . . 



Oenothera biennis 



Plantago major 



Polygonum Hydropiper 

 Portulaca oleracea 



Quercus rubra 



Rumex crispus 



Setaria glauca 



S tell aria media 



Thuja occid entalis 



Trifolium rep ens 



Verbascum Thapsus... 



5TH 

 YEAR 



IOTH 

 YEAR 



I5TH 

 YEAR 



20TH 

 YEAR 



* 



O 



o 



* 



25TH 

 YEAR 



Prof. L. R. Waldron has shown that in the case of 

 some weeds there is delayed germination. He experi- 

 mented with seven different kinds of weed seeds, as fol- 

 lows : Great ragweed or kinghead, wild oats, green fox- 

 tail, shepherd's purse, wild mustard, wild buckwheat and 

 French weed. 



In the fall of 1889 there were planted in a seed bed out 

 of doors at depths of i, 2, 3, 4, 5, 7, and 10 inches the 

 above seeds. During the same fall shepherd's purse pro- 

 duced a few plants at depths of i and 2 inches ; French 

 weed, 25 plants at I inch ; wild mustard, many plants at 

 i, 2, and 3 inches; wild oats, several plants at i, 2, and 3 

 inches. 



During 1900 the seeds continued to germinate, and it 

 was true of them that the small weed seed did not come 

 up through 2 inches of soil ; no seeds buried below 3 

 inches germinated except kinghead or great ragweed 

 and wild oats, which came up through 5 inches of soil. 

 The writer, Miss King and Mr. Fawcett have conducted 

 some experiments on delayed germination of weed seeds. 



It was found that the seeds of different species showed 

 great differences in germination; in general the results 



