WHAT TO GROW IN ROCK-GARDENS 103 



Good Varieties. 

 Lychnis 



alpina (pink), April- June . . . . 6 ins. 



Lagascae (rose-pink), June-Aug. . . 4 ins. 



Viscaria alba (white), May-Aug. . . 12 ins. 



Nepeta Mussini : A useful, easily grown rock-plant, 

 producing lavender blue flowers throughout the summer, 

 commencing in May. It is useful for hanging over good 

 sized stones, or may be planted on a gentle slope close to 

 the base of the rock-garden. It is not at all fastidious as 

 to soil or position, and will do quite well in a shaded site. 

 Height about 12 ins. 



Onosma : This should be grown in all rock-gardens of 

 good size. It is not hard to grow and does well in crannies 

 between stones where there is plenty of soil. The position 

 should be high and dry, and sunny, but it must be arranged 

 so that the roots can go down and find moisture. Plant 

 in November or March. 



Good Varieties. 

 Onosma 



alba rosea (white changing to rose-pink). 



June-Sept. . . . . . . 9 ins. 



taurica (yellow), May-Aug. . . . . 6 ins. 



Oxalis enneaphylla : A pretty free-growing little rock- 

 plant which does best in partial shade such as is afforded 

 by a North-West aspect. It does well in a sandy soil, but 

 it is important that no lime should be present ; plant near 

 sandstone rocks. It does not matter much when it is 

 planted; any time between November and March being 

 suitable. Height about 6 ins. The flowers are white and 

 large, produced in June and July. 



Phlox : The alpine species are distinct from the border 

 varieties mentioned in Chapter VII. Many of them are 

 extremely beautiful and quite easy to grow if set in pockets 

 of well-drained soil in a sunny position. In the summer 

 they require watering, and the more robust sorts must be 

 cut back slightly. They can be planted in October or 



