It is the DWC hydroponic at work
it got really rapid growth rate and undergrowth expansion. I am guessing you are growing in soil? I suggest you try a DWC bucket, DWC you pretty much keep the plant on lifesupport, it is less forgiving then soil so have to make sure to read all the facts about it, EC, PH, temperature, light proofing and so on. I started out in soil 8-9 years ago but quickly got in to DWC after that, the comparisment from the soil vs DWC runs I did was incredible. You must try it! Edit: Btw. I do not suggest buying them, can build your own very easy and cheap.