CHAPTER XXI 



THE WILD ROSES OF OTHER LANDS 



The exotic species of roses enjoy a very wide distribu- 

 tion ; they are found throughout Europe, the temperate 

 and sub-temperate parts of Asia, and North America. 

 Most of them are hardy in the British Isles. A few, 

 however, may only be grown in the warmer counties, 

 whilst two or three require glass protection. As a rule, 

 they succeed without any special cultural attention, 

 providing good loamy soil is given them. The majority 

 do not require regular pruning, although they are im- 

 proved by being thinned out occasionally. Mildew 

 and scale insects attack some of the species and cause 

 serious injury if not dealt with as soon as they appear. 

 Spraying with Bordeaux mixture usually suffices to 

 check the former, but in addition to spraying when the 

 white, mealy, fructification stage of the fungus is visible 

 during summer and autumn, the plants must be sprayed 

 once or twice during the following spring, when the 

 young leaves are beginning to unfold, for at that period 

 the dormant mildew spores are becoming active. Scale 

 insects may be destroyed by spraying the plants with 

 paraffin emulsion several times during the latter part of 

 April and early May. 



As a rule, propagation is most readily effected by 



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