Why Does My Homemade Jam Go Mouldy. 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. If that happens throw.
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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. Yes i have also had the strawberry jam go mouldy. This is likely to happen to a jar that has been previously opened or if the jars were not properly sterilized before the jam was poured and sealed.
Your surrounding conditions are humid this is causing the mould formation in jams.
In jam making the fruit is heated which softens it and also kills yeasts fungi and other microbes which are naturally present on the surfaces of the fruit. It also often happens that a pot is. The mold typically grows on areas of jam that are either stuck on the walls etc. If that happens throw.
