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Pure maple syrup should be kept in a cool, dark place for up to two years until opened and then refrigerated after opening where it will last one year. If excess water is present or if containers are not clean when filled, there may be the growth of bacteria, yeast or mold during storage.
All I can say is there is a HUGE difference between real maple syrup and the maple flavored cheap pancake syrup. You need to try it! Where I live a small bottle of the real stuff is about $6 and you can get a much bigger bottle of flavored crap for like $3.You should go shopping, get both and have a maple syrup challenge. suggest using pure maple syrup and not that flavored stuff like Log Cabin or Aunt Jemima. those are made with corn syrup and flavored with maple.