Chop them and mix with their feed
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Much as with mint and lavender, adding some fresh marigolds to your chickens' nesting boxes can help keep them insect-free. If your chickens eat the marigold petals, their egg yolks, beaks, and feet will become a gorgeous, vibrant orange color. Marigold is also an antioxidant and helps detoxify the body when ingested.Why do you want to make them eat marigolds?
I found this blip:I would be very careful with Marigolds. There is a reason they don't eat them and the reason maybe is that some chickens may be allergic to them. As an herb used also by humans, Marigold can cause anaphilactic shock in some folks as Marigolds are high on the list of allergens. They cause runny nose, coughing, etc...
I started my girls on Layena layer feed when it came time for laying. Layena uses Marigold extract in their feed so "color up the yolks". After one month on this feed, all my girls had diarrhea and runny noses. But the worst case was one of them had a sour crop that even after vets care at a clinic and nearly died, was incredibly difficult to treat. I changed out all the feed, got them started on another brand, and within 24 hours, everybodys symptoms disappeared, including the sour crop.
The vet and I determined that they had an allergic reaction to the Marigold extract in the Layena. So be very careful with these. If your chickens are not eating them, do not force them down their throats. Your yolks will be a brighter color if the birds are allowed to free range as it is all the foliage that they consume that colors up the yolks. If you can not free range as I don't, offer them Alfalfa hay. The chickens are only interested in the leaves. The leaves are very high in protein, calcium and will really brighten up those yolks.