Can Chickens Eat Lawn Clippings? Only Fresh and Short

Short, fresh, untreated clippings: yes. Long ones cause crop impaction, a heap ferments within hours, and a treated lawn passes chemicals to the birds and into their eggs.

Why length is the whole issue

A chicken has no teeth. It swallows grass whole into the crop, where it waits before passing to the gizzard to be ground.

• Short pieces move through normally
• Long strands wind around each other into a dense fibrous ball that cannot pass

That ball is impacted crop, and it is why a bird that has been into a pile of long clippings goes off its feed, stands hunched with a firm swollen crop, and gets worse over days.

Grazing birds do not get this. A hen tearing at a lawn takes short bites because that is all her beak can manage. The hazard is specifically the pile of cut material a mower produces.

The chemical problem

Whatever is on the lawn goes into the chicken.

• Herbicides — including common broadleaf weed-and-feed products
• Insecticides, including grub treatments
• Some fertilisers at high rates
• Moss killers containing iron sulphate

Observe the interval printed on the product label before birds go on the grass or eat its clippings — and if you do not know what was applied or when, do not use the clippings. For laying hens this is not only about the bird; residues can reach the eggs.

Doing it properly

1. Mow regularly so the clippings are short. A mulching mower is best
2. Collect and use them the same day
3. Scatter a thin layer across the run rather than tipping out a bucket
4. Let them work through it — chickens enjoy picking over scattered greens
5. Rake up what is left at the end of the day
6. Compost the surplus rather than leaving it in the run

The better version of the same idea

If greens are the goal, there are safer ways to supply them:

• Let the birds onto the lawn, in a tractor or under supervision. They self-regulate, the grass gets manured, and nothing is impacted
• A grazing frame — a mesh panel laid over grass, so birds nibble the tops without scratching the roots out
• Leafy kitchen greens, hung up to make them work for it
• A planted run corner, fenced until the growth is established

A lawn mown short is one of the better supplements a backyard flock gets. A heap of long grass left by the mower is one of the more common ways a healthy hen ends up at the vet.