Canning blueberry jam begins by mashing fresh blueberries and cooking them in a pot with water, lemon juice, sugar, balsamic vinegar, and pectin. Once cooked, ladle the blueberry jam into sterilized canning jars and process in a boiling water bath canner for 5-15 minutes, per elevation.
Is it Better to Water Bath Can or Pressure Can Blueberry Jam?
Blueberry jam should be processed using the water bath canning method. You should not pressure can blueberry jam because the high heat will ruin the texture of the jam.
Fruit pickles and preserves are high in acid and can be successfully processed in a boiling water bath canner. With this canning method, hot jars are immersed in boiling water for a given period. Any trapped air leaves the canning jars, creating a tight seal.Print
Substitutions and Sweeteners in Canned Blueberry Jam
You can substitute sugar with stevia or Splenda when making jam, but the texture of the final product may be thinner. Sugar allows your homemade blueberry jam to thicken and enhances the distinctive sweet taste of blueberries.
Tips for Canned Blueberry Jam
- Always use hot jars and place the filled jars in the boiling water canner as soon as they are filled.
- Be careful to preserve ratios; pectin requires the correct amount of sugar to set.
- For the best texture and flavor, use blueberries immediately after picking.
- If the jam doesn’t set, add a little more lemon juice and fruit pectin.
- Make sure you use a large pot to make jam.
- Use sterilized jars to prevent botulism when home canning.
Should Pectin Be Used When Canning Blueberry Jam?
Pectin is an optional ingredient in blueberry jam recipes, but it allows the jam to jell properly. Pectin also reduces the cooking time for a fresher berry flavor. If you decide to omit it, make sure to cook the jam a little longer for any excess moisture to evaporate.
What is the Difference Between Blueberry Jam and Preserves?
Blueberry jam is made by mashing whole fruit and has a smoother texture than blueberry preserves. Preserves usually contain larger pieces of fruit.
How Long Does It Take to Can Blueberry Jam?
From start to finish, it takes 13 to 25 hours to can a batch of blueberry jam. The preparation and processing time takes less than an hour, but the jam needs 12-24 hours to cool.
The Best Way to Store Canned Blueberry Jam
Sealed jars of blueberry jam should be stored in a cool, dry, dark place. Always store jam jars at least six inches off of the ground, and avoid storing canned foods anywhere near natural light sources. Take care not to store the jam in an area with high humidity or stagnant air, as this can cause rusting around the lids and may interfere with the seals.
What is the Shelf Life of Canned Blueberry Jam?
Properly canned and sealed jars of blueberry jam can last up to 12 months. Before using your homemade blueberry jam, be sure to check that the jar is properly sealed and the contents show no visible signs of spoiling. Opened jars of canned blueberry jam should be stored in the refrigerator and consumed within three weeks.