I dunno where you live...but crotons (bet you'd recognize one if you saw it,
you just don't know what it's called)
are mostly *outside* plants where I came from - south
FL. Since warmer weather has even hit MileHigh here,
and if you keep the cats inside as I do, why don't you just move the crotons
outside to a porch or your yard?
Few of our cats have chewed on plants....but all it takes is once, as was
pointed out. If you let your cats go outside, then maybe you can put all the
crotons in some
room that stays closed where they can't get in.....
I have been amazed since moving here almost a year ago
to see plants I always thought (when we lived in s.FL) needed lots of sun
and heat to be happy growing and thriving beautifully *inside* - i.e.
crotons @ low-lighted waiting room @ chiropractor's office - as if these
plants lived outside here during winter it would be all over for them.