This was discussed Here . But I would like to give thanks to Sir Lazuli, Creeperkid, and S'moregoth.
Brambles
Brambles are plants that work like netlles, doing damage when stepped on. There are 2 versions: Withered Bramble that looks dead, they spawn in Mordor, Angmar, and possibly Dol Guldur. Brambles, brambles look alive like thorny bushes and spawn in basically every lush biome, both do damage and slowness like a spiderweb but to a much lesser degree, while walking through one.
Hedges
Hedges look similiar to leaves, they form walls around Hobbit Villages (When added) and act as gardens on Hobbit homes. Variants are: Withered Hedge: a dead looking hedge with thorny branches sticking out. They deal damage when walked into, and spawn only in Mordor. Lush Hedges, they look lively and lush with plenty of leaves, Lush hedge is the Hedge that spawns in the Garden of Hobbits, and Hedge which is not to lush and not too dead. Both Lush Hedge and Hedge do no damge when walked into but act as walls. When Hobbit Villages are added a wall will spawn around it made of Hedge and the odd Lush hedge. Hedge takes longer to break than leaves, lush hedge takes much longer to break and withered hedge takes the same amount as hedge