Posted: 09/08/2015 at 16:28
The Anderson's, yew CAN grow a foot a year. however,,it depends on so many factors how quickly growth is.
the clue for me is when you added you can see the roots so they prob arent planted deep enough.
Yew is pretty forgiving....it tolerates most everything except waterlogging and ......being moved. After 6 years, no, I wouldnt replant them.
can you mulch them? And in spring I would feed them with a good,organic granular fertiliser
think I am in the minority here but I would prune back your plants to same height. They will still grow but with more density