222 CLOVERS 



west than the medium red, but in the greater portion 

 of this region it will not succeed. The adaptation 

 of the North Atlantic States, including those of New 

 England, is not of a high order, but rather more so, 

 probably, than for the medium red. 



In Canada also the adaptation of medium and mam- 

 moth clover is much the same as for the medium 

 red. In some parts of Ontario, especially Western 

 Ontario, it grows remarkably well ; but in the mari- 

 time provinces it does not grow so well ; nor does it 

 thrive in the provinces of the Canadian Northwest 

 as it does in Ontario. 



As with medium red clover, the distribution of 

 this variety has not been fully determined in either 

 the United States or Canada, more especially on soils 

 of the prairie, where it does not succeed well at 

 present. It is probable that under some conditions 

 on these soils, and also in the South, the absence 

 of the requisite bacteria in the soil may account, in 

 part, at least, for failure in attempts made to 

 grow it. With the introduction of these, the 

 area of successful cultivation may be considerably 

 extended. 



Soils. Mammoth clover may usually be success- 

 fully grown in soils well adapted to the growth of 

 the medium red variety. (See page 65.) This 

 means that it will usually grow with much luxuri- 

 ance in all areas which produce hardwood timber, 

 and are usually covered with a clay or muddy loam 

 soil underlaid with clay. It will also grow with 

 great luxuriance in the volcanic ash soils of the irri- 

 gated valley lands of the Rocky Mountain States, 



