86 ROGK GARDENING FOR AMATEURS 



they soon become overcrowded. Nymphaeas should be 

 at least three feet apart, and it is necessary to give more 

 space unless occasional thinning out is adopted. If 

 the formation of a small pond is out of the question, 



a cask, cut in 

 two, and sunk 

 in the soil, will 

 form a good 

 substitute when 

 only one Water 

 Lily is desired. 

 Every care 

 should be taken 

 to ensure that 

 the pond or pool 

 harmonises with 

 the scheme of the 

 rock garden, and 

 to give it as 

 natural an ap- 

 pearance as pos- 

 sible. 



An Artificial Stream. Streams, either natural or 

 artificial, are most ornamental in a rock garden. Un- 

 happily they are seldom available. It is possible, how- 

 ever, to have a short stream to carry water from the 

 source, whether this be a tank or a tap from the public 

 supply, at a comparatively low cost. A good deal depends 

 on the height of the source above the pond, and whether 



Tubs for Water Lilies arranged in a rock 

 border. 



