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How to Make Blueberry Jam and Jelly

making blueberry preserves using the waterbath or boiling water method

jam blueberry jar

For every 2 half pint (8 oz) jars of blueberry jam...
Traditional Jam
Reduced Sugar Jam
Prepared Fruit
1 1/3 Cups
1 1/3 Cups
3 tsp
3 tsp

Ball RealFruit Classic Pectin

1 1/2 tsp
1 1/2 tsp
Granulated Sugar
1 2/3 cup
1 cup
*Do no exceed 10 jars per batch - set may not occur in larger batch sizes.

crushing blueberries with potato crusher

  1. For every three pints of blueberries discard the stems and crush berries. This makes roughly 4 cups of crushed berries (or one pint / two half pint jars)
  2. Crush blueberries one layer at a time using a potato masher
  3. Wash jars and bands in hot, soapy water. Rinse with warm water. Drain well before filling.
  4. Pour boiling water over flat lids in saucepan turn off the heat. Let stand in hot water until ready to use.

roaring boil blueberry jam


  1. Prepare the water-bath canner, jars and lids according to manufacturer instructions, if preserving.
  2. Prepare and measure the ingredients for recipe.
  3. Combine prepared fruit and lemon juice in an 8 quart saucepan. Gradually stir in Ball RealFruit Instant pectin.
  4. Bring mixture to a full roaring boil that cannot be stirred down, over high heat, stirring stirring constantly.
  5. Add entire measurement of sugar, stirring to dissolve. Return mixture to a full roaring boil. Boil hard 1 minute, stirring constantly. Remove from heat. Skim foam, if necessary.

pouring hot blueberry jam into jar


  1. Ladle hot jam into hot jars, one at a time, leaving 1/4 inch headspace. Wipe rims. Center lids on jars. Apply bands and adjust to fingertip tight.
  2. Place filled jars in canner ensuring jars are covered by 1 to 2 inches of water. Place lid on canner. Bring water to gentle, steady boil.
  3. Process jars for 10 minutes, adjusting for altitude. Turn off heat, remove lid and let jars stand for 5 minutes.
  4. Remove jars and cool. Check lids for seal after 24 hours. Lid should not flex up and down when center is pressed. Clean and store jars according to manufacturer's instructions.


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