First of all, sorry for suspecting GT xD
It’s a mod that adds TONS of new flora. Like really, a lot. It’s been in my hosted Modpack forever because it really makes the world a lot more “fancy”.
Also adds a lot new growable Vegetables which helps with Spice of Life 
Regarding the thing that it’s not to be found anywhere:
10Pak took down his mods from basically all of the Internet and said “I can’t deal with publicly developing my mods, I’m taking them with me goodbye” and wasn’t heard from again. Somebody on MCF created their own fork using downloads from boogie, third party hosters like 9minecraft and decompiling & reassembling the code to port to future versions, but it didn’t work the greatest
I can send you the last version I still have archived since then, or if you chose randomly found .jar; MD5 of the latest version from a credible site plantmegapack-4.33-1.7.10-1492.jar 9E3917B1EA4234A179FEAC31781DB612 
(Oh also I’m probably starting to MineTweak the OreDict values myself, or are you planning on something?)