Can Chickens Eat Spinach?

In moderation — spinach is nutritious but its oxalic acid can interfere with calcium.

Reviewed against extension and veterinary guidance · Last reviewed July 2026

Verdict

In moderation

⚠ Oxalic acid binds calcium — too much can affect eggshell quality. Feed occasionally.

The details

Spinach is rich in vitamins and iron, but it also contains oxalic acid, which can bind calcium and, in large regular amounts, interfere with eggshell formation. As an occasional green it is beneficial; as a daily staple it is not ideal for laying hens.

How to serve it

Offer a small amount of raw or cooked spinach once or twice a week, not daily.

Treat rules that apply to everything

Whatever you're feeding, the 90/10 rule is the one to remember: at least 90% of a hen's intake should be balanced layer feed, and no more than about 10% treats and scraps. Layer feed is formulated to deliver the protein and calcium that eggshells and feathers are built from — pile on the treats and you dilute it, which shows up as thin shells and a slowed-down lay.

That is a stricter limit than it sounds. Ten percent of a dozen hens' daily feed is only about 4.8 oz of treats — for all twelve birds combined, not each. Work out the limit for your own flock with the chicken treat calculator.

Chickens have no teeth: they grind food in the gizzard using grit. Birds that free-range pick up their own, but a confined flock needs insoluble grit available whenever they eat anything beyond feed. Introduce any new food in a small amount and watch the flock for a day — droppings are the quickest tell that something didn't agree with them.

Two rules that override everything else: never feed anything mouldy, since some moulds produce mycotoxins that can kill a bird, and never feed heavily salted, sugary, or processed human food. If you wouldn't eat it, it doesn't go in the run.

Frequently asked questions

Can chickens eat spinach?
In moderation — spinach is nutritious but its oxalic acid can interfere with calcium. Spinach is rich in vitamins and iron, but it also contains oxalic acid, which can bind calcium and, in large regular amounts, interfere with eggshell formation. As an occasional green it is beneficial; as a daily staple it is not ideal for laying hens.
How should I feed spinach to chickens?
Offer a small amount of raw or cooked spinach once or twice a week, not daily.
Can baby chicks eat spinach?
In small amounts, once chicks are around two weeks old. Because spinach is only a "sometimes" food for adults, keep it to an occasional taste for chicks, and offer chick grit so they can digest it.
How much of a chicken's diet can treats be?
Follow the 90/10 rule: at least 90% of what a chicken eats should be balanced layer feed, with treats and kitchen scraps making up no more than about 10%. The feed carries the protein, calcium, and micronutrients that keep hens laying — treats dilute all of that if they take over.

Can chickens eat…?

Sources

Verdicts follow established poultry nutrition and veterinary toxicology — the toxic compounds named on these pages (persin, theobromine, solanine, thiosulphate, phytohaemagglutinin, oxalic acid) are documented, not folklore. Last reviewed July 2026.