258 TREES AND SHRUBS 



Hydrangea. — ^The many varieties of the common 

 Hydrangea are all valuable for the greenhouse, 

 particularly Cyanoclada, MariesHi Rosea, Stellata, and 

 Thomas Hogg. To obtain small flowering plants 

 the cuttings are struck in spring or early summer, 

 grown on freely for a time, and well ripened by full 

 exposure to air and sunshine before autumn. Plants 

 grown in this way readily respond to a little heat 

 in the spring. Larger specimens, too, may be brought 

 on in the same way. The Japanese H. paniculata 

 grandiflora needs quite different treatment, the plants 

 being generally grown in the open ground, from 

 whence they are lifted and potted in the autumn. 

 Before potting prune the long, wand-like shoots back 

 hard, leaving only about two eyes at the base. By 

 so doing the plants are kept dwarfer, and the flower 

 heads are larger than if no pruning were done. By 

 some the Hydrangea is grown as a standard, and 

 is very effective when in beauty. 



Itea virginica. — A neat little bush, about a yard 

 high, with dense spikes of white flowers. It needs 

 a sunny spot in a cool and moist soil, and under 

 these conditions will flower freely if carefully lifted 

 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 



