He won't stop munching and vomiting

I know at Walmart you can buy a variety of sprays to deter animals from messing with stuff. I have the anti-scratch spray and it works but only if I use it everyday. There is an anti-chew spray that I assume tastes bad, you could try that, pr your coudl just try spraying the plants with something you already have that tastes bad, like perfume.

I wish I could help, but unfortunately I cannot. We used to have a cat that would eat all kinds of crazy things like that. My mom had a really big faux flower arrangement on her table and the darn cat ate every last bit of it leaving only the plastic and wire. She used to eat balloons and ribbons and yarn too. We could never get her to stop doing it. Hope you can find a solution to your problem. You may want to call your vet to see if there is some sort of deterrent you can spray on them that won't hurt the cat but will keep it away. Good luck :)

no, he'll just eat the perfume ON the plants. get rid of the plants. it's that simple. sorry, but that's all you can do. or get rid of him in favor of the silk plants and that for me wouldn't be an option.