38 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



objects. I have found these thrive best under culture, either in 

 pots, placed in a sunny open place, or planted on rocky buttresses 

 standing out from the face of the rockwork. These buttresses 

 may be formed of rocky debris of limestone or granite (the plants 

 appear to thrive equally well on either), but it is necessary that 

 the roots should be able to penetrate to a good depth. Others 

 may be planted in situations fully exposed to the sun on the 

 sides or upper surfaces amongst broken stones ; whilst the beau- 

 tiful S. longifolia of the Pyrenees prefers to be planted vertically 

 between stones, and for choice looking towards the west. Other 

 sorts in this section, such as S. Aizoon and varieties, S. lanto- 

 scana, S. pyramidalis, will thrive anywhere on rocky walls; 

 whilst a special few, such as the beautiful S. Burseriana and 

 S. csesia, always impatient of moisture, need the highest and 

 best-drained situations that can be given them. Once established 

 in such situations, plants of this section form dense tufts of 

 silvery foliage often from G inches to 1 foot in diameter. They 

 bloom abundantly during the months of April, May, and June, 

 the flowers being mostly white, but sometimes, as in S. Macnabi- 

 ana, with carmine or red spots on the petals. Success in the 

 culture of these plants depends on the use of gritty or sandy soil, 

 on good drainage, an open sunny aspect, and plenty of water in 

 summer whilst the plants are in a growing state. 



The most ornamental of the Encrusted Saxifrages, including 

 also the smaller growing sorts, are : S. aretioides and varieties ; 

 S. Burseriana, S. csesia, S. carinthiaca, S. lantoscana, S. 

 crustata, S. diapensioides, S. luteo-purpurea, S. Malyi, S. mar- 

 ginata (one of the prettiest of all), S. patens, S. Eocheliana, and 

 S. squarrosa. The larger growing sorts with good spikes of 

 flowers are S. Aizoon and its many varieties, S. carniolica, S. 

 Cotyledon, S. longifolia and varieties, S. lantoscana, S. Macnabi- 

 ana, and S. pyramidalis. The last is not quite hardy, but it is 

 an excellent pot plant, and is very much grown by market 

 gardeners. 



The Saxifrages with round, fleshy leaves, of which the 

 common London Pride (S. umbrosa) is a familiar example, are 

 of easy culture. They do well as border plants, and spread 

 freely where they have warmth and moisture. Hence they are 

 very suitable to plant in beds at the foot of the rock garden. 

 S. granulata, our Marsh Saxifrage, requires the dampest nooks. 



