all the plants, can't find. XD

does it have to mature or something? because i tried breaking and right clicking it and it doesn't seem to drop anything. i'm on mod version 1.10.2-beta-0.8.5

Yeah, just let it sit there for some time. It need light, but not water or anything.

You need to find a Wild Cotton plant. It is a harvestable bush and as such is harvested on right click. It spanws like anything else, naturally and via plantball.