Quick answer
Collard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Leafy green safety check
Can Cats Eat Collard Greens?
Collard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
Preparation
Wash and remove tough stems.
Watch-outs
Rotate greens.
Why this answer changes by species
Cats usually rely on complete cat food. That makes collard greens different from a generic human-food answer, especially around plant-heavy treats, dairy, alliums, and flavored leftovers.
Related foods for cats
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Sources used
FAQ
Can cats eat collard greens?
Collard greens may fit only as a tiny occasional amount for cats. They should not replace the normal diet.
How should collard greens be prepared for cats?
Wash and remove tough stems.
What should I watch for with collard greens and cats?
Rotate greens.