ummm, After a bit of searching, the only mention of SJW & mould is here. **Keep an eye on it and check it often to make sure no mold is forming and, if you do see mold, use a sterile spoon to scoop it out of the jar before recapping. Wilting your plant material beforehand helps prevent mold from forming.** https://www.aromaculture.com/blog/st-johns-wort I'll keep looking.