Canning Plum Blackberry Jam

Looking for a delicious and easy-to-make jam recipe? Try canning your own plum blackberry jam! This sweet and tangy spread is perfect for toast, biscuits, and more. Follow our step-by-step guide to learn how to make and can your own jam at home.

The past couple of years I have been experimenting with making homemade jams. If you are new to canning, it might seem a little overwhelming, but if you are interested in getting started, canning plum blackberry jam is very easy, and a great place to start.

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I have made several batches of blackberry jam. It really only takes a couple cups of blackberries to make some great blackberry jam. This year I was able to pick my own blackberries (for free!) so I was excited to get started making some jam.


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The same day I picked blackberries, I was also able to pick some plums. When I got all the fruit home, I had no idea what I was going to do with all of it! I knew I was going to make jam with the blackberries, but had no idea what I was going to do with the plums.


After looking around online, I found some recipes for making Plum-Blackberry Jam. I thought this was an interesting combination, and I was definitely skeptical! I decided to give one of the recipes a try, however, because I didn’t have anything else to do with the plums.


Related Article: How to Ripen Plums: Tips and Tricks for Perfectly Ripe Fruit


For this recipe I used liquid pectin, called Certo Sure-Jell. There are other ways you can make jam, but I have had really good luck with this brand of liquid pectin, so I definitely stick with what works.


When making cooked jam, the main thing to keep in mind is to follow the instructions exactly. When you are measuring, make sure to make exact measurements. I cannot emphasize this enough.


It will make the difference as to whether your jam sets or not, and you don’t want to go to all that effort and not have your jam set!


This recipe makes approximately 4 pints or 8 half pints of jam.


Love the taste of fresh berries and stone fruit? Preserve the flavor by canning your own plum blackberry jam! This recipe is simple and yields a delicious spread that's perfect for gifting or enjoying yourself. Follow our instructions to learn how to make and can jam like a pro.


Plum Blackberry Jam Recipe


3 c. crushed plums
1 c. crushed blackberries
7 1/2 c. sugar
1 pouch liquid pectin


Before you start, fill your boiling-water canner half full of water and start it simmering.


Wash and sterilize your jars, lids, and screw bands. The easiest way to do this is run them through the sanitize cycle in the dishwasher and remove them from the dishwasher to use when they are still hot.


To prepare the plums, you first need to peel them. To easily peel plums, let them set in boiling water for approximately 1 minute and then dunk them in ice cold water. The skins will slip right off. Next remove the pits and chop the plums finely.


Related Article: Canning Plum Sauce


To prepare the blackberries, rinse them thoroughly and then use a potato masher to crush them in a bowl.


At this point you don’t have to have measured perfectly. Mix the fruit together in a saucepan with 1/2 cup water and bring to a boil. Reduce heat, cover, and simmer for 5 minutes.


When you remove the fruit mixture from the pan, measure 4 1/2 cups of the cooked mixture. This is the measurement that counts, and the amount you need to make the jam.


Note that you can change the amounts of blackberries and plums to suit your tastes, but the finished cooked mixture should measure 4 1/2 cups.


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Measure exactly 4 1/2 cups of the fruit mixture into a stock pot. Stir in the sugar. Add 1/2 tsp. butter or margarine to reduce foaming if desired. Bring the mixture to a rolling boil on high heat, stirring constantly. (Note: A rolling boil doesn’t stop bubbling when you stir).


Quickly stir in the package of liquid pectin. Return to a full rolling boil and boil exactly 1 minute, stirring constantly. Remove from heat. Skim off any foam, if necessary.



Canning Instructions


Quickly ladle mixture into sterilized jars, filling to within 1/8 inch of the tops. You can easily measure the headspace with this inexpensive canning funnel.


Wipe jar rims with a wet cloth to make sure you get a good seal. Place lid and screw band on jars and screw bands tightly.


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Using tongs, lower jars into a boiling water canner. Water should cover the jars by 1 to 2 inches. If there is not enough water, add boiling water as necessary. Cover and bring the water to a gentle boil.


Boil for 10 minutes (check the chart included with the pectin to adjust boiling times for different altitudes). Remove jars from the canner and place upright on a towel to cool completely.


After the jars have cooled, check the seals by using your finger to press down in the middle of the lid. If the lid pops back up, it is not sealed. You can still eat the jam, but it must be refrigerated and eaten within a couple of weeks.


Related Article: Canning Blackberry Pie Filling


Let jars stand at room temperature for 24 hours before moving to storage. This is to make sure the jam sets completely. Do not disturb the jars while they sit. Your plum blackberry jam can be stored in a cool dark place for up to 1 year.


Yield: Approximately 4 pint jars or 8 half-pint jars


So what did my family think? They LOVED it. I also made some plain blackberry jam, and between the two jams, they definitely liked the plum-blackberry the best. I liked this recipe so much that it’s now one of my top favorite plum canning recipes.


Related Article: Plum Custard Kuchen


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