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Most cats will shy away from most mainstream human herbs...things like oregano, basil, thyme or rosemary are not really palatable to cats.
You could order large amounts of cat grass seed on Amazon (I get mine here: https://www.amazon.com/Catgrass-Sweet-Oats-Cats-Seeds/dp/B0035XQ7D8 ) for really, really cheap.
If you wanted to grow something you could share with them...parsley is a good option. The mild flavor makes it tasty for cats, and it does have some breath freshening properties, so that's an added bonus!
I hope this helps.