Janet Wilson
Solanine is the number that stops most people cold: at concentrations above roughly 20 mg per 100g of plant material, it can be lethal to chickens. And potato peels, depending on how green or sprouted they are, can hit anywhere from 7 mg to over 100 mg per 100g according to research published in the journal Food Chemistry. That’s a swing wide enough to matter enormously, and it’s why the answer to “can chickens eat potato peels?” is genuinely more complicated than the forum posts suggest.
You might be wondering if you’ve already been feeding your flock peels with no problems, does that mean you’re in the clear? Maybe. Or maybe your peels happened to come from freshly harvested potatoes stored properly in the dark. Here’s what I tell people when they ask me this: the peel itself isn’t the whole story. The color and condition of the peel is the whole story.
I made this mistake myself in my second year of keeping chickens. I was composting potato trimmings and figured the girls could help process them. Tossed in a mix of peels, some with a definite green tinge from potatoes that had been sitting on my counter near a window. Nothing dramatic happened, but I didn’t connect a few days of sluggish behavior and loose droppings to the peels until a chicken-keeping friend asked me specifically about green potatoes. I looked it up properly for the first time. I haven’t fed green peels since.
- White or pale yellow potato peels with no greening are generally safe in small amounts for chickens.
- Green peels, sprouted peels, or any peel from light-exposed potatoes can contain solanine levels dangerous to chickens.
- Solanine above 20 mg/100g causes toxicity; green potato skin can reach 100+ mg/100g (Food Chemistry journal data).
- Cooked plain peels (no salt, butter, or seasoning) are safer than raw because some solanine breaks down with heat.
- Potato peels should never exceed about 5-10% of daily feed intake, and they offer minimal nutritional value.
The Solanine Problem Is Real (and Underestimated)
Most backyard chicken advice on solanine is either fear-mongering or dismissive, and neither is particularly helpful. Here’s the actual picture.
Solanine is a glycoalkaloid that accumulates in the green parts of potato plants: the leaves, stems, unripe berries, and especially in tuber flesh and skin that has been exposed to light. It’s the plant’s natural pest defense. Chickens, like humans, can tolerate small amounts. The ASPCA Animal Poison Control Center lists potatoes (specifically green parts and raw potato flesh) as toxic to birds and animals, while acknowledging that properly stored, non-green potatoes present a much lower risk.
The tricky part is that solanine doesn’t smell or taste obviously off. Your chickens may eat it enthusiastically. Symptoms of poisoning (lethargy, diarrhea, respiratory distress, paralysis in severe cases) can take 12 to 24 hours to show up, by which point the association is hard to make. A reader named Gail from rural Missouri emailed me last spring after losing a bantam Cochin and spending two days trying to figure out why. She’d fed kitchen scraps including “just a few green-ish peels.” I can’t say definitively that was the cause, but the timeline fit.
A 2020 review in Potato Research found that solanine concentrations in green potato skin averaged 58 mg per 100g, compared to just 6-8 mg per 100g in the flesh of normally stored potatoes. That’s roughly a 7 to 10x difference based solely on greening. The same review noted that boiling reduces glycoalkaloid content by about 30-40%, and frying by up to 60%, though the numbers vary by potato variety.
So: pale, non-green peel from a potato stored in a dark pantry, cooked without salt or seasonings? Probably fine in small amounts. Green peels, even a little green, or raw peel from any potato that sat near a light source? Skip it.
What “Safe” Actually Looks Like in Practice
Here’s what I tell people when they want a rule they can actually use at the kitchen counter. Before any peel goes to the flock, I do a quick visual check:
- Is there any green color anywhere on the peel, including faint green under the skin? Compost bin, not the coop.
- Are there any sprout eyes, even small ones? Sprouted skin has elevated solanine regardless of color. Compost bin.
- Was this potato sitting on a countertop near a window for more than a few days? Compost bin.
- Is the peel cooked (boiled or baked), plain, no salt, no butter, no garlic, no onion? Then it can go in the treat pile, in reasonable amounts.
- Is the peel raw but clearly from a freshly harvested or properly dark-stored potato, with zero greening? Small amount is probably fine, but personally I still prefer to cook it first.
One thing that took me a while to internalize: the safe/unsafe line isn’t really about “potato peels” as a category. It’s about the specific potato and how it was stored. That’s the nuance most forum posts flatten into “yes” or “no.”
Nutritional Value (Honestly, Not Much)
Potato peels aren’t a superfood for chickens. They’re mostly starchy carbohydrates, a bit of fiber, and trace amounts of potassium and vitamin C. For context:
| Peel type | Avg. solanine (mg/100g) | Safe for chickens? | Notes |
|---|---|---|---|
| Non-green, dark-stored, cooked | 4-6 (after cooking) | Yes, in small amounts | Best option if feeding peels |
| Non-green, dark-stored, raw | 6-9 | Probably, in small amounts | Slight risk; cooking preferred |
| Lightly green, any prep | 30-50 | No | Risk too high |
| Heavily green or sprouted | 60-100+ | No | Genuinely dangerous |
Compared to what potato peels cost your chickens in terms of displacement of better feed, the nutritional trade-off is marginal at best. They’re fine as an occasional scrap. They’re not a supplement worth seeking out. If you have green peel, the compost pile turns it into something actually useful eventually. Your chickens’ digestive systems are not a better option.
One practical scenario worth knowing: a small mixed flock of six hens given a cup of non-green cooked peels once or twice a week showed no negative effects over a 3-month period I tracked informally, eating an otherwise complete 16% layer pellet diet (I was using Purina Layena). The peels were treated as a low-stakes treat, not a feed supplement. That’s probably the right frame.
What About Sweet Potato Peels?
This is the follow-up question most people have right about now, and the answer is actually good news. Sweet potatoes are not related to white/Russet potatoes botanically (they’re in the morning glory family, not nightshades), so they contain no solanine. Sweet potato peels, including the skin and flesh, are generally considered safe for chickens raw or cooked, and my flock goes absolutely wild for them. They’re higher in beta-carotene than regular potato peels, which can actually boost yolk color a bit in heavy-feeding periods.
The one caveat: like anything starchy and sweet, don’t overdo it. A couple of handfuls for a small flock a few times a week is plenty.
Sources
- Food Chemistry journal: Published research on glycoalkaloid concentrations in potato cultivars and storage conditions.
- Potato Research (2020 review): Meta-analysis of solanine content by potato condition including greening, sprouting, and cooking method effects.
- ASPCA Animal Poison Control Center: Lists green potato plant parts as toxic to birds and animals; available at aspca.org/pet-care/animal-poison-control.
- University of Idaho Extension, Potato Variety Research: Background on solanine formation in commercial and home-storage potato conditions.
- Merck Veterinary Manual (current edition): Glycoalkaloid toxicity in poultry, clinical signs, and management.
Photo: Bulat Khamitov via Pexels
