Hampshire,
United Kingdom 
how do you prune hydrangea panticulata vanilla fraise
24 Jul, 2010
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This type of Hydrangea flowers on wood grown this year (new wood). So in February you may, if you so desire, remove as much of the old wood (ie laster years growth) as you want. It depends on how tall you want the bush to grow. If you do not prune then it grows new material from the old and gets taller.
24 Jul, 2010