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How to Can Asparagus in a Jar
You can can asparagus in a jar by using a pressure canner, because asparagus is a low-acid vegetable and boiling water baths simply aren’t safe for it.
If you’ve ever wondered how to can asparagus in a jar so it stays shelf-stable for months, the answer is pressure canning.
This method reaches the high temperatures needed to destroy dangerous bacteria like Clostridium botulinum, which can thrive in low-acid foods.
In this post, we’ll walk through how to can asparagus in a jar step by step, from picking the best spears to sealing them for long-term storage.
Whether you’re new to canning or you’ve canned pickles and jams before, learning how to can asparagus in a jar safely is a rewarding skill.
Why You Should Can Asparagus in a Jar
Canning asparagus in a jar is one of the best ways to preserve a bumper crop, and here’s why it’s worth the effort.
1. It Keeps Asparagus Fresh for Over a Year
When you properly can asparagus in a jar, those spears can sit on your pantry shelf for 12 months or longer.
That means fresh-tasting asparagus in soups, casseroles, or straight from the jar, even in the middle of winter.
2. It Saves Money and Reduces Waste
Asparagus season comes fast and furious, and it’s easy to end up with more spears than you can eat.
By learning how to can asparagus in a jar, you turn that surplus into pantry gold instead of compost.
3. You Control the Ingredients
Store-bought canned asparagus often contains added salt or preservatives you might not want.
When you can asparagus in a jar at home, you decide exactly what goes in, whether that’s just a pinch of salt or nothing at all.
How to Can Asparagus in a Jar Step by Step
Ready to get started on how to can asparagus in a jar safely and successfully?
Here’s the full process, broken down into simple steps.
1. Gather Your Equipment and Ingredients
To can asparagus in a jar, you’ll need a pressure canner, mason jars, lids, rings, and fresh asparagus spears.
You’ll also want canning salt, a jar lifter, a bubble remover, and clean towels for the counter.
2. Choose and Prep the Freshest Asparagus
The best asparagus for canning in a jar is fresh, firm, and bright green with tight tips.
Wash each spear, trim off the woody ends, and cut them to fit your jar size, leaving about one inch of headspace.
3. Pack the Jars Tightly and Add Salt
Pack the asparagus spears upright into hot, sterilized jars, tips facing up for a pretty presentation.
Add half a teaspoon of canning salt per pint or one teaspoon per quart if you like seasoned asparagus.
4. Pour in Boiling Water and Remove Air Bubbles
Ladle boiling water over the asparagus, leaving one inch of headspace at the top.
Run a bubble remover around the inside of the jar to release trapped air, then wipe the rims clean.
5. Seal the Jars and Load the Pressure Canner
Place the lids and rings on the jars, tightening them finger-tight only.
Set the jars on the rack inside your pressure canner with water according to the manufacturer’s instructions.
6. Process at the Right Pressure and Time
For pints of asparagus, process at 11 pounds of pressure for 30 minutes, adjusting for altitude if needed.
For quarts, process at 11 pounds of pressure for 40 minutes to can asparagus in a jar safely.
7. Cool, Check the Seals, and Store
After processing, let the canner depressurize naturally, then wait a few minutes before opening the lid.
Remove the jars, let them cool for 12 to 24 hours, and check that each lid sealed with a firm, downward press.
Common Mistakes to Avoid When You Can Asparagus in a Jar
Even seasoned canners slip up sometimes, so keep these pitfalls in mind when you can asparagus in a jar.
1. Using a Water Bath Instead of a Pressure Canner
This is the biggest mistake of all, and it’s a safety issue.
A boiling water bath can’t get hot enough to safely can asparagus in a jar, so always use a pressure canner.
2. Skipping the Headspace
Too little headspace can cause jars to overflow or seals to fail.
Too much headspace can leave food exposed and lead to discoloration when you can asparagus in a jar.
3. Ignoring Altitude Adjustments
If you live above 1,000 feet, you’ll need to increase the pressure when you can asparagus in a jar.
Check your local extension office for the correct poundage based on your elevation.
So, How Do You Can Asparagus in a Jar?
You can can asparagus in a jar by pressure canning fresh spears in boiling water with a little salt, processing pints for 30 minutes and quarts for 40 minutes at 11 pounds of pressure.
It’s not complicated once you know the steps, and the payoff is a pantry full of tender, home-canned asparagus ready whenever you need it.
Just remember to always use a pressure canner for low-acid veggies like asparagus, keep that one-inch headspace, and adjust for altitude.
Once you know how to can asparagus in a jar, you’ll never look at a spring harvest the same way again.