MidnightSugar there are a few trees... they aren't heavy on the spawn rate but that can be tweaked and increased.... I had so many people messaging me for this so I released it mostly finished and tested but some things still need to be tweaked and I'll be adding custom dungeons as well as a more 1.7.10 friendly version.
This is just the first of many more packs that will be released but I'm not going to release many details yet due to being swamped with requests to hurry up... lol
But they will be just as good and some even more epic and I have a list of more than 50 so the amount you guys will have available may exceed most perverse abilities to spawn them all due to world borders.
So yea.... expect to be able to have many many diverse environments.