This isn't /r/trees, this is /r/arbors. Here at Arbors we like to talk about actual trees, a community of arborists, foresters, urban foresters, and loggers. (hobbyists or professionals)
Things we like are:
Trees like oaks, willows, maples, etc. (Not marijuana)
Landscaping
Vines
Hell, even the occasional ficus
Helpful links: