I canned tomatoes following a recipe from the Ball Blue Book. I have used a few quarts. Just the other day I noticed that in some jars, seeds have sprouted. What caused this?
Lane County Oregon
Your tomatoes were probably close to germination inside the tomato before you canned them. This happens on some varieties more than others and also happens when the tomatoes are on the overripe side. It is called vivpary. Now that they are canned and exposed to liquid I assume the seeds crack open and you can see the sprout.
We don't recommend canning tomatoes that are over ripe because the acid level diminishes. Hope you added lemon juice. I would suggest boiling them for 10 minutes or using in a cooked dish that is cooked for at least 10 minutes to be sure there is no risk of botulism.
Hope that answers your question. Thanks for using Ask an Expert