That statement is very unlikely in normal food conditions.
Fresh blueberries don’t stay safe or good “for years” just by putting them in a jar at room temperature or even in a pantry. Over time they will:
- Mold (often inside where you can’t see at first)
- Ferment (turning sour or alcoholic)
- Lose nutrients and texture
- Become unsafe to eat due to bacterial growth
What actually works for long storage
If you want blueberries to last a long time, safe methods are:
- Freezing: best option (lasts 8–12 months easily)
- Drying/dehydrating: can last months if sealed properly
- Canning or jam-making: lasts 1–2+ years if properly sterilized and sealed
About “jar storage”
A simple jar without proper canning (heat sterilization + vacuum seal) does not preserve fruit safely long-term. It might look fine for a while, but spoilage can still happen inside.
If you tell me what you’re trying to achieve (no freezer space, convenience, meal prep, etc.), I can suggest a safe preservation method that fits your situation.
