My last location was all outdoors in a massively high RH location.
It's sub-tropical, mountains (600m altitude), surrounded by jungle.
Low RH there is like 70%, average maybe 75-80%, and high is like 85-95%.
All my plants got some kind of mold, some worse than others.
But my last 4 weeks (from week 5-9) were all like 85-90%,
raining every day, when not raining its fog and mist, bare minimum is heavy cloud.
So, with this high, and they all got it, don't know where the cut off is.
And it's not just RH, it's also the time, how long they are at that RH.
Mine was weeks on end.......
@912GreenSkell would be the better grower to ask, IIRC.
Someone who hovers at the edge between mold and no mold.
Though, my Jack 47 really wasn't too bad at all.
Just a spot a couple of inches down from the tip of the main cola.
Like the Mazar, she was a fairly big open frame on her.
Less leaf, more calyx, so less water got trapped in her buds.
When I am reading this, I think I have pretty good conditions.
I think my RH will drop soon, summer is slowly coming, it can't rain more than those days. Last year I know we had 25-30% RH through days. So perfect for flowering, let's hope this year summer will be the same as last year.