I have a viburnum (wrightii I think) which until recently was buried in a scruff of weeds, ivy, and vines. It is quite old and its branchess are very woody and leggy. My question is: Should I cut it back to very low — about a foot high — in order to rejuvenate it? At present it has about 4 feet of bare branch before there are leaves, although then there are quite a few leaves and a lot of lovely shiny red berries. Any opinions would be appreciated!