How mature? Now that I think about it...my dad planted a bunch when I was a kid....huge now. One was severely damaged mebbe 10 yrs ago...cut away the dead/damage....give mother nature time to do what you can't....fix it.
Now ya don't notice it....
Big azz trees....
I planted one the Fri before Mathew's straight line winds decided nope....sat it back...tied it up. Sooo....removed the lines a few months back....tree is mebbe 15' now....healthy ....
well...she was bent over at about 3' at a 90 degree angle....staked again...beotch
Hardy, big beautiful trees....
I have never fertilized trees...nature does.