What Should You Not Put In A Juicer? The Complete No-Go List
You just unpacked your new juicer, excited about fresh juice every morning. You grab a bunch of kale, some apples, and a banana. You toss everything in. The machine whines, jams, and starts leaking pulp. Suddenly your counter looks like a crime scene.
I’ve been there. Most people make this mistake exactly once. The problem is that many common foods simply don’t belong in a juicer. They clog the screen, burn out the motor, or produce a sad, watery mess that tastes nothing like you expected.
You Think I’m Sarcastic You Should Hear What Tee
You Think I’m Sarcastic You Should Hear…
You Think I’m Sarcastic You Should Hear What I Don’t Say Funny Sarcastic Retro Vintage Tee for dad, mom, husband, granddad, friend, or anyone who loves her job, Perfect for birthdays, Christmas, Thanksgiving, Halloween,any occasion.
See on AmazonThis article gives you a straight list of what to avoid. No fluff. I’ll explain exactly which fruits, vegetables, and other items can damage your machine or ruin your juice. Stick with these rules and your juicer will last years longer.
If you’ve had that kind of kitchen disaster, you might appreciate the You Think I’m Sarcastic You Should Hear What I Don’t Say T-Shirt. It’s a lightweight, classic-fit tee that makes a perfect conversation starter for anyone who’s ever fought with a kitchen appliance. Great for birthdays or just as a little inside joke.
1. Fruits That Destroy Juicers (And Your Patience)
Some fruits are basically juice-killers. They don’t have enough liquid or their texture jams the machine.
Bananas
Bananas are the number one culprit. They turn into a thick paste that smears across the screen. No juice comes out. You just get a clogged machine and a sticky mess. A banana is meant for blending, not juicing. If you want banana flavor, blend it into your finished juice in a separate step.
Avocados
Same problem. Avocados have high fat content and almost no water. They’ll gum up the gears. Leave them for guacamole.
Mangoes and Papayas (When Overripe)
Firm, underripe mangoes can work in some masticating juicers. But once they get soft and squishy, they behave like bananas. Stick to firm fruit if you must juice mango.
Rhubarb Leaves
This is a safety issue. Rhubarb leaves contain oxalic acid in high concentrations. They’re toxic. Only juice the stalks. Even the stalks can be tough on cheaper centrifugal juicers—they’re very fibrous.
2. Vegetables That Fight Back
Leafy greens and fibrous veggies cause the most frustration for beginners.
Kale (Especially Thick Stalks)
Kale leaves are fine in a slow masticating juicer. But the thick central stalks are woody and clog the screen. Cut the leaves off the stalks before juicing. Even then, some budget juicers can’t handle kale well. Check your machine’s power rating—anything under 150 watts will struggle.
Wheatgrass
Wheatgrass is extremely fibrous. A standard centrifugal juicer will clog almost instantly. You need a dedicated wheatgrass juicer or a masticating model with a specific wheatgrass attachment. Trying it in a cheap machine can burn out the motor. I’ve seen it happen.
Celery (Whole Bunches)
Celery is fine in moderation, but large amounts can create a stringy pulp that wraps around the auger. Cut celery into shorter pieces. Don’t jam whole stalks in at once.
Sweet Potatoes and Yams
Raw sweet potatoes are very dense and starchy. They produce a thick, starchy juice that separates quickly and tastes unpleasant. They’re also tough on the machine’s blades. Cook them first if you want to juice them—but even then, the result is better blended.
3. The Freezer Mistake and Other Temperature Rules
Frozen fruit seems like a good idea. It isn’t—unless you understand the limitations.
Frozen Berries, Mango Chunks, or Ice Cubes
Most home juicers cannot handle frozen items. The blades or auger are not designed to crush ice. You’ll either stall the motor or crack the gear housing. A few high-end masticating models claim to handle frozen fruit, but even then, you risk damage. Defrost your fruit first.
Hot Liquids
Never pour hot tea, soup, or boiling water through a juicer. The plastic parts may warp. The seals can fail. Stick to room temperature or cold ingredients.
Nuts and Seeds
Juicers are not nut mills. Whole almonds, sunflower seeds, or flaxseeds will scratch the screen and may jam the machine. If you want nut milk, use a blender and strain it. Some juicers have a separate nut milk attachment, but that’s a different operation.
4. How to Prep Produce the Right Way
A little prep goes a long way. Follow these rules and you’ll avoid most problems.
- Peel citrus — orange and lemon peels contain oils that make juice bitter. Also, the white pith can clog the screen. Always peel citrus before juicing.
- Remove pits and stones — peach, apricot, cherry, and avocado pits are hard enough to chip a blade. Always pit fruit.
- Chop tough veggies — cut carrots, beets, and sweet potatoes into 1-inch chunks so the machine can process them smoothly.
- Layer hard and soft ingredients — start with a hard item like an apple, then add soft greens, then finish with another hard item. This pushes the softer stuff through the blades.
If you’re struggling with pulp not coming out properly, check out this omega juicer troubleshooting guide—many issues are the same across brands.
| Item | Can You Juice It? | Why or Why Not | Best Method |
|---|---|---|---|
| Banana | No | Creates paste, no liquid | Blend into finished juice |
| Avocado | No | High fat, gums up machine | Eat fresh or make guacamole |
| Kale (leaves only) | Yes (masticating) | Leaves juice well; stalks clog | Cut off stalks, use slow juicer |
| Wheatgrass | With special attachment | Too fibrous for standard juicers | Use dedicated wheatgrass juicer |
| Frozen berries | No | Ice crystals damage blades/motor | Defrost first, then juice |
| Sweet potato (raw) | Not recommended | Starchy, tough on blades | Cook and blend instead |
| Citrus (peeled) | Yes | Pith and peel add bitterness | Peel completely, remove seeds |
Frequently Asked Questions
Can you juice bananas in any juicer?
No. Bananas do not contain enough water to produce juice. They turn into a thick paste that clogs the filter screen. Some slow masticating juicers can handle a small amount mixed with watery fruits, but the yield is tiny. Skip bananas altogether.
What about avocado—can it be juiced?
Avocado is another fruit that simply doesn’t juice. Its creamy texture and high oil content will coat the interior and prevent extraction. If you want avocado in a drink, blend it with milk or juice after juicing your other ingredients.
Can I juice frozen fruit if I let it thaw slightly?
Thawed fruit works fine. The problem is ice crystals—even partially frozen pieces can be too hard. Let frozen fruit fully thaw in the fridge, then juice immediately. Don’t try to juice fruit that still has ice chunks.
Is it safe to juice citrus peels?
Technically you can, but you shouldn’t. The peel contains oils that make juice bitter. Commercial orange juice gets its flavor from cold-pressed peel oil, but home juicers can’t control that. You’ll end up with unpleasant, bitter juice. Always peel citrus.
Can I put wheatgrass in a regular centrifugal juicer?
Most standard centrifugal juicers cannot handle wheatgrass. The blades spin too fast, and the grass jams the screen. You either need a masticating juicer designed for leafy greens or a dedicated wheatgrass press. For more details on choosing the right machine, see this cold press juicer review—it explains the difference.
What To Remember Next Time
- Bananas, avocados, and soft tropical fruits belong in a blender, not a juicer.
- Remove pits, peels, and hard stalks before juicing anything.
- Frozen fruit must be fully thawed—ice can damage your motor.
- Wheatgrass needs a specialized machine or attachment.
- Cut hard vegetables like beets into small chunks to prevent jams.
- Layer ingredients: start with a hard item, follow with soft, end with hard.
- If your machine clogs frequently, clean the filter screen immediately—it’s often just a buildup issue.