Check ph and cut down on nutes.
Most autos flower around 4-5 weeksclean means what? and clean and made for cannabis sort of sound different. if it was made for, then it has certain compositional attributes that make it made for. if one is compost, then itmight be rich or hot, if it has worm castings or sea weed or who knows what in it it has something in it. even just dirt isnt just dirt. some lean sandy, some loamy, some peaty... so, that matters.
so, by clean soil you might mean potting soil? special for cannabis, maybe means ph neutral? that means it is more than likely buffered. i was looking for a name, i could research and find what is what.
by the way, i know nothing, just been really studying up on soil since i use it. so if any of the other folks with experience, the for real kind, not like my book learning stuff, say contrary or differing views, id listen to them (or at least google the shit out of it!)
good luck! you sure these are only 4 weeks old? they are already flowering!
Yeah sometimes the bottom leaves will get all ugly and fucked up its pretty common happens to me. As long as the stuff up top is green and healthy and most importantly the newest growth needs to be healthy that is most important. Lower grungy looking stuff should always be stripped off. I do it immediately once it starts to yellow that way the plant can focus all its energy on the new stuff. Autos overall don't need as much defoliating but regulars need a ton. Some strains are really bushy you gotta be plucking lowers constantly.Thanks a lot for calming me down if you say it’s overwatering I hope the flush won’t make it worse but at least I learn