274 TREES AND SHRUBS 



in the autumn and potted. It must not suffer from 

 dryness afterwards. No pruning is necessary. 



JAMESIA AMERICANA. A pretty little white-flowered 

 shrub from the Rocky Mountains. It will bloom 

 freely under glass, but must not be forced hard ; 

 it may be treated in the same way as the Itea. 



KALMIA. All the Kalmias are good pot shrubs. 

 The roots are dense and wig-like, reminding one of 

 those of a Rhododendron, so that well-budded plants 

 can be lifted in the autumn and potted without 

 risk. They must be brought on gradually in a cool 

 house, and never suffer from want of water. The 

 earliest to bloom is K. glauca, followed by K. 

 angustifoliciy while later on there is the largest and 

 best-known species, K. lattfotia, the Mountain Laurel 

 of the United States, which has pretty pink flower 

 clusters. 



KERRIA JAPONICA (the Jews' Mallow). The single 

 Kerria is a twiggy bush, with bright yellow flowers, 

 like those of a single Rose, and expand quickly in 

 spring. The major form of the double Kerria is 

 much better than the ordinary one ; they can be 

 potted in autumn or grown permanently in pots. 

 After the flowering season is over the double variety 

 can be spurred back hard to prevent a tall weakly 

 growth. 



LABURNUM. This has long been used for the 

 greenhouse, and very effective it is when well 

 flowered. It is as a rule most successful when in 

 large pots, in the shape of a standard. Prune 

 back moderately after flowering. 



