Let me get this straight. He wants to go out in the forest and pick some weirdass plants and grow them in his room. Then he wants to cultivate marijuana in there, not worrying about since he's sure his parents won't think twice of his strange crackhead behavior. If they do find the marijuana plant that he's been attending to every day carefully, his excuse is "i found it".

I can see it now... "*giggle* i dunno, it looked cool *holding laughter* so fuck! mom, i grew it! i just think its some weeiiiird *laughing* plant, it looks cool huh?!!!"