I don’t know if they did here what they did on reddit, but since trees is cannabis communities here, try searching marijuana enthusiasts to find arboreal assistance. If that doesn’t help, try searching using terms like arborist, arboretum, and other tree terms.

Maybe try looking for something named “marijuanaenthusiasts?”

There’s lots of communities for plants in general, but I can’t find much for trees specifically. Closest and most active would probably be https://kbin.social/m/Plants or https://kbin.social/m/gardening

I hope you don’t mind I clicked your profile, you might try reaching out to the Texas A&M AgriLife Extension if you’ve got a specific issue. They can even do a soil sample for you.

mander.xyz has a few for plants as well

https://mander.xyz/search?q=plant&type=Communities&listingType=Local&page=1&sort=TopAll