How To Make Syrup From Black Walnut Trees

You can make syrup from black walnut trees by tapping them in late winter and boiling down the sap into a rich, dark syrup.
 
Black walnut trees produce sap that can be turned into syrup, just like maple trees do, though the flavor is distinctly different and the process takes a bit more patience.
 
If you’ve ever wondered how to make syrup from black walnut trees, you’re in the right place because it’s a rewarding backyard project that connects you to the land.
 
In this post, we’ll walk through how to make syrup from black walnut trees step by step, from identifying the right trees to tapping and boiling.
 
Let’s get started.
 

Why You Can Make Syrup From Black Walnut Trees

You can make syrup from black walnut trees because their sap contains natural sugars that concentrate when boiled.
 
Here’s why black walnut trees work so well for syrup production:
 

1. Black Walnut Sap Is Sweet and Tappable

Black walnut trees, like maples, run sap in late winter and early spring when temperatures swing between freezing nights and warmer days.
 
This sap is thinner than maple sap and contains less sugar, but it still makes excellent syrup with a robust, nutty flavor.
 
The sugar content in black walnut sap typically ranges from 1% to 2%, which means you’ll need more sap to make syrup.
 

2. The Flavor Is Unique and Prized

Syrup from black walnut trees has a deep, rich taste that’s often described as earthy, bold, and slightly nutty.
 
Many people who make syrup from black walnut trees say it’s a nice change from the lighter maple flavor, perfect for drizzling over pancakes or baking.
 
Because it’s less common, black walnut syrup also makes a great gift or a special treat to share with friends.
 

3. Tapping Black Walnut Trees Is Sustainable

Tapping doesn’t harm the tree when done correctly, so you can make syrup from black walnut trees year after year.
 
A healthy black walnut tree can produce sap for decades, and the process actually helps the tree by relieving some internal pressure.
 
Just make sure you only tap trees that are at least 10 to 12 inches in diameter to keep them strong.
 

How to Tap Black Walnut Trees for Syrup

Tapping is the first real step in how to make syrup from black walnut trees, and timing is everything.
 
You’ll want to tap when daytime temperatures rise above freezing but nighttime temps are still below 32°F.
 
Here’s how to tap black walnut trees for syrup:
 

1. Choose the Right Tree and Spot

Pick a healthy black walnut tree with a straight trunk and no signs of disease.
 
Drill a hole about 2 inches deep at a slight upward angle, around 3 feet off the ground.
 
Use a 7/16-inch drill bit for standard taps, and avoid drilling near old tap holes.
 

2. Insert the Spile and Hang Your Bucket

Gently tap the spile into the hole with a hammer until it’s snug.
 
Hang a bucket or sap bag on the spile to collect the sap as it drips.
 
Check your buckets daily because sap can run fast on warm, sunny days.
 

3. Collect and Store Sap Properly

Pour collected sap through a filter into food-grade containers.
 
Keep sap cold, ideally below 38°F, and boil it within a few days to prevent spoilage.
 
If you can’t boil right away, freeze the sap until you’re ready to make syrup from black walnut trees.
 

Boiling Black Walnut Sap Into Syrup

Boiling is where the magic happens when you make syrup from black walnut trees.
 
Because black walnut sap has less sugar, you’ll need to boil off more water than with maple sap.
 
The general ratio is about 60 to 80 gallons of sap for 1 gallon of syrup, so plan for a long boil.
 

1. Boil Outdoors or in a Well-Ventilated Area

Always boil sap outside or in a garage with the door open.
 
The steam is sticky and can coat your walls, plus it’s a lot of moisture to release inside.
 
Use a large, shallow pan over a wood fire or propane burner to speed up evaporation.
 

2. Watch the Temperature and Consistency

As the sap boils down, it turns darker and thicker.
 
Use a candy thermometer and stop boiling when the syrup reaches 219°F (about 7°F above the boiling point of water).
 
You can also check by dipping a spoon in; if it coats the back and drips slowly, it’s ready.
 

3. Filter and Bottle Your Syrup

Once your syrup is done, filter it again while hot to remove any sediment.
 
Pour it into sterilized glass jars or bottles and seal them tight.
 
Properly bottled syrup from black walnut trees will keep for a year or more in a cool, dark place.
 

So, How Do You Make Syrup From Black Walnut Trees?

You make syrup from black walnut trees by tapping them in late winter, collecting the sap, and boiling it down until it thickens into a rich, dark syrup.
 
It takes more sap and more time than maple syrup, but the unique, nutty flavor is absolutely worth it.
 
Whether you’re a homesteader or just curious about backyard sugaring, learning how to make syrup from black walnut trees is a fun and tasty adventure.
 
Give it a try this season and enjoy the fruits of your labor.