Hello, all: I have a Hick's yew in my backyard and am building a new garden
box to hold three or four more. I'm not describing this very well, but
what I need to know is how deep a Hick's yew's roots will go. The one I
have right now is about 6-7 feet tall and ideally I'd like the new ones to
grow to the same height, but I need to know how much room to leave for the
roots.

Any information will be gratefully received!

David