Quantity
A chicken pecking at rhubarb leaves over several days can accumulate enough oxalic acid to cause kidney damage. Even a single session of eating several leaves could be dangerous for a standard-sized hen.
Notes
The most common scenario is chickens free-ranging in a garden where rhubarb is growing. Rhubarb leaves are large, low to the ground, and easy for chickens to reach. The stalks are less toxic but still contain meaningful levels of oxalic acid. If you grow rhubarb and keep chickens, fence it off — no exceptions.
Negative Signs
* Drooling and beak irritation
* Watery or bloody droppings
* Lethargy and fluffed-up feathers
* Soft-shelled or shell-less eggs
* Decreased water intake followed by increased thirst
* Tremors and weakness
* Kidney failure in severe cases
FAQ
Q: My chickens nibbled on a rhubarb stalk. Is the stalk as bad as the leaves?
A: The stalks are much less concentrated than the leaves, so a nibble on a stalk is far less concerning. But the stalks still contain oxalic acid, so don't let it become a habit. The leaves are the real danger — keep your flock away from those entirely.
Alternatives
Leafy greens like kale, cabbage, and Swiss chard (in moderation) are much safer options for your flock. Hang a cabbage from a string for entertainment and nutrition at the same time.
Risks & Disclaimer
If your chickens ate rhubarb leaves, provide plenty of fresh water and contact an avian vet. Offer calcium-rich foods like crushed oyster shell to help counteract the calcium-binding effect. Watch for changes in egg quality and droppings over the following days.
