THE HORTICULTURAL SOCIETY OF NEW YORK 



type. A very good illustration of this type is to be found in the 

 Hanbury Garden at Brockhurst in Sussex. Here a large part of 

 the garden was made by excavating in sandstone rock, thus form- 

 ing a deep ravine with almost vertical sides, the crevices in the 

 rocks afterward being filled with suitable soil and planted. The 

 rock obtained in excavating was used to extend the garden, grad- 

 ually getting away from the ravine idea until the rock garden be- 

 came merged into the surrounding landscape. 



Of an entirely different type is the rock garden at Friar Park, 

 the country estate of the late Sir Frank Crisp. This is one of 

 the largest and most pretentious rock gardens in existence, cover- 

 ing, as it does, several acres of ground. Over 7,000 tons of rock 

 were used in its construction and many of the pieces weigh up to 12 

 tons. This garden is of the mound type, and a feature in it is a 

 replica made to scale of the peak of the Matterhorn. 



In the Brooklyn Botanic Garden rock garden, in which glaciated 

 boulders are used, the general idea in construction was to simulate 

 a rock-strewn slope such as one would be likely to find on a ter- 

 minal moraine. 



Other developments of the rock garden idea may be seen in 

 the garden of Childerly Hall in Cambridgeshire where there is a 

 pleasing rock arrangement of the flat type, the planting associated 

 with it being of the herbaceous perennial order as well as the 

 plants that one usually associates with the rock garden. 



Alpines and rock plants can be used to good advantage in parts 

 of the garden other than the rock garden proper. They are, of 

 course, the plants par excellence for dry wall gardening and are 

 well adapted for use in "pavement planting" — that form of garden- 

 ing that uses plants in the crevices between flagstone walks. The 

 problem of a satisfactory dividing line between perennial border 

 and walk can often be met by using rocks and planting between 

 them with alpines so that they become partly covered with vegeta- 

 tion. This has been done with great success in many gardens and 

 notably so in Aldenham House Gardens where a gravel walk is 

 separated from the border by a device of this nature, thus provid- 

 ing an informal and beautiful edging to the perennials. 



It has been stated that the main reason for a rock garden ori- 



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