Can be used to replace Wild Grass in alchemy. 5:1 or 1:1 I started at 5:1 while leveling now at 1:1 but didnt find out about 1:1 until i was already skilled 10 alchemy dont know if this is level based or not.

Since there aren't any guides on the processing parts of the game. I'm assuming the reason i can use weeds in the drying process is because I can dry weeds into hay? How many do I need? 10? What is it for then? Cows? Horses?

its for farming, the haystacks

They should really change that Description... new players think its useless :O
But it's a most wanted item for us lifeskillers

With they I mean the BDO Team, not the Codex Website

Can be gathered in mass at kamasilvia temple, east from Heidel. (not in Kamasilvia, its in the beginning of mediah)
Around the kamasilvia tree is a lot, also overall over the place.