CAMPANULAS 47 



roots, and, therefore, should be placed so that their 

 roots can run under rocks. The kinds, such as caespi- 

 tosa, pulla, and Allioni, which run under the soil, 

 should be given plenty of room for increase, as other- 

 wise they quickly deteriorate. The more difficult 

 species all like a south-west aspect, but many of the 

 more vigorous kinds, such as caespitosa, garganica 

 hirsuta, turbinata, Wilsonii, and pulla do well on the 

 north side if unshaded, and are most useful plants 

 for this purpose. Muralis, as we have said, will thrive 

 also in half shade. With the Pinks and Saxifrages, 

 Campanulas are the most valuable of all families of 

 plants for the rock garden. ' 



