PRUNING FLOWERING TREES 35 



VIBURNUM. All the Viburnums grow thickly, and 

 require an annual thinning. 



VITIS. The methods practised in growing Vines 

 for fruit suits the ornamental species as well. If 

 space is restricted they should be grown on the 

 spur system, and if there is plenty of room then 

 the extension system may be employed. 



WISTARIA. These should be kept spurred in, 

 with the exception of the leading shoots, which 

 merely require a shortening in early spring accord- 

 ing to the strength of the plant. 



XANTHOCERAS. Requires no pruning. 



ZENOBIA. These require no pruning as a rule, 

 but occasionally a hard cutting back will induce 

 healthy growth in place of a weakly one. 



