Even if there were more forums...
We got good respectful knowledgeable people here that frequent them all.
IMO...all You'll ever get is conflicting info..
Every tree...and every yard...different.
If you want to keep any particular plant...
It's best to just get one and grow it Yourself.
Do like
@Anthony and experiment on cuttings while carefully tending mom.
Some info that shouldn't be conflictable.....
Try not to want any particular tree.
It's Ok...
But if you walk into the nursery to buy a Holly, you may pass up a better tree.
Go to the nursery to buy the best trunk and root spread you can afford.
Regardless (almost) of species.
Sure pick up some rooted cutting of Holly too!
Just don't blow your load on ANY one!
After while you'll find stuff that just grows better in your yard...
And you'll probably gravitate towards those.
I'm big on locals.
https://www.bonsainut.com/threads/local-species-awareness-program.20231/
And free!
Sorce