PRUNING FLOWERING TREES 31 



OSMANTHUS. These should not be pruned unless 

 a particular shape is desired, when the plants may be 

 clipped with a pair of shears in spring. 



OXYCOCCUS. This is a small creeping genus allied 

 to Vaccinium, and requires no pruning. 



OXYDENDRON. Remove seed-pods. 



PALIURUS. This attains the dimensions of a small 

 tree, and should be kept trimmed up for that 

 purpose. 



PARROTIA. Thin out in spring after the flowers 

 are past. 



PAULOWNIA. Keep to a single stem to a height of 

 about 8 feet, and then allow it to branch. If used 

 for sub-tropical bedding, it should be cut down to the 

 ground every winter. 



PERAPHYLLUM. The solitary hardy species of this 

 should not be pruned or disturbed in any way if it 

 can be avoided. 



PERIPLOCA. A climbing genus which should be 

 thinned out in winter, and only shortened back if 

 necessary. 



PERNETTYA. These should not be pruned at any 

 time. 



PHILADELPHIA. These should be thinned after 

 flowering, and the old wood cut back to strong 

 young shoots. This is especially important with 

 P. microphyllus, P. coronarius, and P. Lemoinei and its 

 varieties. 



PHILLYR^A DECORA (Vilmoriniana). This well- 

 known shrub needs no pruning. 



PHOTINIA. Requires no pruning. 



