Hmmm, good question. I just cut one down on Sat. and it smelled really fruity at the time, but now, like you mention, it smells just like plant matter - even hay-like. However, if I break a nug apart, you can still smell the old odor, and it smells on your fingers too. I assume this is part of the natural curing process, but this is my first time, so what do I know.