Black substance on stalks and leaves overnight! In the Great NW

I've got a black stain on some of the stalks and leaves since yesterday. Can mold grow and spread that fast? We paniced and harvested today but now that I've got stoned and thinking about this site to find out fer sure I will try to get a picture but it's kinda hard to see. Thanks

Yep, usually mold is caused by bad airflow and not so healthy plant...and spreads like a wild fire...

This plant gets tons of air "wind" and is healthy as a horse it's beautiful.