Typically, these are left unpruned unless you want to encourage newer, more intensely colored stem growth. This can be achieved by a couple of methods: stooling or cutting back the entire plant to a predetermined - usually low to the ground - height. The second method involves removing the oldest stems each season to encourage new, replacement growth from the base. Obviously, the second method leaves most of the plant intact.

You can reduce overall size by performing a modified version of the first method - cutting back the entire plant to a predetermined height of your choice. Follow proper pruning techniques (i.e., no stubs). Regrowth is fairly rapid so if you want to keep the shrubs at less than the 8-10' they typically want to grow to, you will have to repeat this process each season.

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a shrub is a shrub .... and part of the definition.. IN MY WORLD ... is that they are all pruned thru renovation pruning ... sooo .. as such it is not important to find an article specifically addressing RTD ....

as gal noted.. hack it to the ground if its bugging you ..

if you want to maintain some shape.. remove 1/3 for 3 years down at the ground ...

NEVER.. top it at height.. or in a few years.. you will HAVE TO cut it all to the ground ... imagine your same plant .. 6 feet taller at the height you cut it back to ... that sounds more like a recommendation of some guy who wants to come back in few years for his boat payment ...

whatever you decide to do.. i doubt you will harm it.. you can barely kill them if you want.. so just go for it ...

good luck

ken

Here is a link that might be useful: link