Why Is My Homemade Jam Going Mouldy. I place my jars and lids in a hottish rayburn for a minute or two to sterilise and allow to cool a bit before potting so they dont crack. To make the strawberries go through the whole jar and not settle you must allow the jam to cool before potting.
I hate wasting food but I hate the idea of dying from botulism even more. Why does jam go Mouldy on top. Mold spores live in the air and so if oxygen remains in the headspace of the jar chances are that the mold will then grow in your jars.
Fruit can be preserved by making jam by freezing or by drying.
Why does jam go Mouldy on top. But mold spores can sometimes enter a jelly jar via contamination from a utensil that was earlier used on another foodstuffthe bread for example. Strawberry jam is one of the harder jams to make thats why it features in shows a lot. Jam never exists long enough in our house to get mouldy.
