OP, consider this:
Somebody mentioned in another thread a way of forcing plants to finish flowering. The method is to cut a ring around the stalk at the point just low enough that everything you want to harvest is above where you will scrape a ring off the stalk.
Apparently everything above that point finishes in two or three weeks because that is what the plant diverts all of its energy to. BUT, what is relevant for you is this: the plant can no longer suck up water or nutrients from it's roots. What does that mean? The only water it gets is from the air around it/dew/rain.
This won't be a guaranteed protection against mold, but it will reduce the amount of water your plants are taking in (and thereby, I think, decrease the likelihood and/or severity of mold).
If hereafter any highly cultured, poetical nation shall lure back
to their birthright, the merry May-day gods of old; and livingly
enthrone them again in the now egotistical sky; on the now un-
haunted hill; then be sure, exalted to Jove’s high seat,
the great Sperm Whale shall lord it.
— HERMAN MELVILLE, from Moby Dick