In the last week it seems they started flowering or something like that. One is showing white hairs on the top, the tall one (plant#4) started shooting stuff that looks like flower to me from the top and several small stuff of the same sort directly from the nodes close to the top and the other two are also shooting stuff from the top (stuff= i`m a noob and rather say stuff than suppose it`s a flower).

P.S.: I`m starting to fear the 4th could be a male ?!?!??!