Plum Syrup Fail

My poor plum syrup is no more. 😭 

I forgot to tell G to stir it before I left on a three day trip and the plums got moldy. 

Unfortunately, because of the sugar and liquid, if there's any mold, the whole thing has to get tossed. 

Which is really a shame because the second batch had just started to release the juices. 

I talked to a friend of mine with experience making this recipe. I wondered if I had used a faulty recipe. She uses this recipe, which is essentially the same as mine. The main issues with mine were not stirring and using plums that were too ripe. Even though the ones I used weren't ripe, they weren't green enough. The ripe ones mold so quickly, if I would do it again, she suggested I keep it in the fridge to keep the mold from forming until the juices come out.