The Garden of British Wild Flowers. 189 



walls or buildings try and establish a few of the 

 smaller kinds on these ; and while it is very in- 

 teresting to have rare plants established in such 

 places, you will find that the timid and tenderer 

 kinds will always survive on them ; whereas they 

 may get cut off by the winter when on level ground 

 or in pots. This is particularly true of the charm- 

 ing little Sedum dasyphyllum, which everybody 

 having an old wall, or mossy old building of any 

 kind, would do well to endeavour to establish, by 

 putting a young plant in a suitable chink with a 

 little sandy soil around it. Once it has seeded, in 

 all probability the plant will become firmly esta- 

 blished ; the seedlings raised on the wall are sure 

 to live long and perpetuate themselves. 



Not a few small and delicate plants that can 

 hardly be preserved long in a garden in any other 

 way may be grown on a wall. If you are a fern- 

 grower, you will know how difiScult it is to establish 

 the little Wall Rue (Asplenium Ruta-muraria) in 

 pots, pans, or any way in the hardy fernery ; but 

 by taking a few of the spore-bearing little fronds, 

 and putting a little of the " fern-seed" into the 

 chinks of an old wall, you will soon establish it ; 

 and in like manner it is quite possible to cultivate 

 the Geterach and the graceful Spleenwort (often 



