Solution: bitter apple available at the pet store.

I doubt that it is harmful unless the roses have been sprayed as roses are
on the list of edible foods.  They don't taste that great though so not sure
what the attraction is to kitty.

Two of our cats do this, and have never shown any ill effects. Keep in
mind that roses are actually vegetables (or maybe fruit? What is the
technical classification of rose hips?), and it is only due to some strange
quirk that the blossoms are valued in a different way by some humans ;-)

It can be annoying, of course, to have your lovely bouquet savaged, and
the houseplant-munching housecat is a matter of lore and legend (cf.
Garfield). One of our two rose-consumers is prone to eating a great
many other houseplants, and one lovely cactus was almost destroyed
before we finally wised up and put it in a hanging basket where it
could not be reached.

--
Jerry Kohl <jeromekohl@comcast.net>
"Légpárnás hajóm tele van angolnákkal."