By Daveymad
Devon,
United Kingdom 
Rhododendron prune.
I have a rhododendron bush which must be about eight foot (in old money) tall. The problem with it, is that it has gone really scraggy and it only produces leaves at the top of the plant. How far can I realistically prune it back without killing it and encourage it to start shooting leaves from the base again.
19 May, 2020
yes you can:
this is the link to the RHS
https://www.rhs.org.uk/plants/popular/rhododendron/growing-guide
19 May, 2020