I Canned Fruit and My Jars are Sticky! Help!

August 16, 2022
canned peaches in mason jars

I get a lot of emails every summer (particularly during peach season) from people who have canned fruit for the first time and they’re wondering if their sealed jars are safe to be tucked away on the shelf. The reason they’re worried? The finished jars are sticky on the outside.

Friends, this is an entirely normal thing to experience when canning fruit in liquid like syrup, juice, or water. Raw or lightly cooked fruit flesh contains air. During the canning process, that air escapes from the fruit and pushes its way out of the jar (this is why we only tighten the canning rings to finger tip tight, that air needs to be able to exit the jar). This is normal.

Often, as the air leaves the jars, it pushes a little bit of the liquid that was in the jar out. This process of escaping air pushing liquid out can continue after the jars are removed from the canner (it is known as siphoning in the canning world). That sticky residue is the result of the liquid loss.

canned pears in mason jars

If your jars are sticky but the seals are good, there is nothing to worry about. Once the jars are completely cool, remove the rings and gently wash the sealed jars in warm, soapy water. Let them air dry and store in a cool, dark place.

If your jars are sealed, but have lost a lot of liquid, they are still good, but they aren’t going to hold their quality as long as those that still have their full complement of liquid. Make a point of using the jars with the depleted liquid first. If you notice that the top piece of fruit is discolored because it is not fully submerged, don’t worry. Just discard any with color or texture loss due to exposure and eat the remainder.

canned tomatoes in a variety of manners

How to prevent liquid loss and sticky jars

Here are some things you can do to avoid getting into a sticky situation next time!

Consider making a hot packed preserve rather than a cold packed one. Cold packing means that you peel your peaches, layer them in jars, and then cover them with syrup. This creates a situation in which you are more prone to have liquid loss.

Instead, peel your peaches and drop them into hot syrup (or whatever liquid you are using as your canning medium). Then funnel the hot peaches into jars and cover with hot liquid. The short time the fruit spends in the liquid helps remove some of the air from the fruit flesh and makes for a jar that is less likely to siphon. This technique also allows you to get a bit more into each jar, which is very satisfying.

These Gingery Pickled Peaches are a great example of a hot packed peach.

jars of canned peaches

Another thing you can do is let the jars rest in the canning pot for 5-10 minutes after the canning process is done. Rapid temperature change is one of the things that triggers liquid loss. Once your timer goes off, turn off the heat (if you have an electric stove, consider sliding the pot off the hot burner), remove the lid from the canning pot, and just let the jars cool down more slowly. After the time is up, pull one jar out. If it is still leaking liquid, return it to the pot and set another 5 minute timer.

Rest assured, even if your jars are sticky, you still have something delicious and safe to enjoy.

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15 thoughts on "I Canned Fruit and My Jars are Sticky! Help!"

  • I put the hot item ,boiling, transfer to microwave for a minute . clean top and put lids and bans on and turn upside down on counters. Seals everytime.peppers and salsa mostly

  • Not peaches but dill beans. I have liquid loss in my dilly beans. Some of the ends are poking into the air space. Beans freak me out a bit because of botulism. Are these dilly beans safe to eat?

    1. They are still fine. Pickles are another thing that can siphon. Luckily, the beans are like little straws and draw the brine up inside themselves. As long as you used a recipe from a reliable source, processed as instructed, and the jars are sealed, they are fine.

  • Great post! It clearly explains what I have finally learned after processing over 40 ‘projects’. I wanted to mention that it’s important not to leave your jars in the water (heat turned off) longer than the 5 minutes (or another 5 if necessary) after processing. One time I forgot and the water cooled. Water went back into some of my jars. I have learned that timing and temperature cause most of your problems in canning. Stick to the recipe and you are good.

  • This was such a helpful post! I have canned for at least four decades, but never heard of leaving the jars in the canner for 5-10 minutes after turning it off. Made a huge difference in the liquid level, I am so pleased! Thank you!

  • Thank you for all of your helpful information! I am a seasoned canner of 30+ years and I still have some oopsies even when I do everything right! Yesterday I canned a half bushel of peaches and had some siphoning occur. Very frustrating! But on the bright side they all sealed!

  • Thanks for this! Lol, I’m one of those people who wrote to you, as much as I’ve read about canning, I’d mostly only done thick jam-like things and had never encountered or read about this. Thank you for you answer to me and this longer post, very helpful!

  • Is this also true for apple pie filling? It seems to have leaked out of the jar but the jar is sealed. Is it still safe? Would there be product under the lid preventing a true seal?

    1. It is very true for apple pie filling. That product is a known siphoner. As long as the seals are good, it is fine.

  • In addition to leaving the jars to cool in the canner for a while, I also add a glug of white vinegar to the water in the canner. It helps alleviate hard water residue as well.