To craft Grasspers for the "Holding On" quest in the Witchery quest line you as asked to place a chest 'with Long Grass on each side'. This was somewhat confusing because I thought it meant to only place 2 grass, one on each side of the chest. After consulting the Witchery site i saw that i need to surround the chest. Perhaps you can change the wording to be 'with Tall Grass on every side'?
"Each" is synonymous with "every," the only difference being in connotation; each implies individual units grouped together one by one as a set, every implies all units in a more collective sense, so as you can see, even the minor difference between them is virtually nil. The wording is as clear as it can get without explicitly stating the exact number of sides, and you're the first person I've seen that's had that problem (I could also add that other Witchery rituals like that have a four-sides set-up and not a two-sides, and while I don't know for sure, I'm fairly certain that one of the books documents such types of rituals).