I've also run in to this problem! Last tree I need, I'm running all over the place I've read where wood trees are supposed to be, but alas, I can find none. If anyone could help me (and Zora!) out I'd really appreciate it :) Thank you!
I planted twelve wood trees in talish crest quarters yesterday, which made it 20+ there amongst the different streets. I don't live there, so no idea if they're still living, but I figured it at least let me answer that neverending question on global chat for a day!
We're trying to gather a large group of Home Owners with a Wood Tree so we can direct Glitches that are looking for a tree to the group chat to find a tree (especially once Global Chat goes down). Obviously there's Glitchy tools and such, but we're trying to create a more co-operative in-game system for Wood Tree finding :)