Not sure of that one, but I have heard that Coleus canina will do the trick.

Notthat I am aware of.

not in my experience and nor does the coleus grrrr :o)

i don't think anything deters cats. :o((

Well there is the odd really pickly plant that they wont go near - for example Aciphylla but you would not want that in the same garden as small children lol

or rabbits-- they had a high old time with the coleus-- the stoats seem to have done the trick ! -- how about a dog?

Dog's are no good Pam iv'e got two.LOL

Okay let's start looking at options. I am not aware of any plant that will 'deter' cats. However, cats like to defecate in open ground. If you keep your ground planted up they will not use as a toilet. If you have ground that needs to be bare cover with something like bark (NOT composted bark) or a good layer or grit/gravel. If you are actually trying to prevent cats entering your garden at all well... good luck, getting your own cat is possibly the best solution.

My (now deceased) cat never went into the cactus garden. Unfortunately, I couldn't say the same of the gophers!

and we think we have troubles Tug!

thanks to all for suggestions . have got scaredy cat on order.is this a perennial?

Half Hardy perennial but don't be surprised if it has no effect!

thanks to all for replies .have got scaredy cat on order, is this a perennial?

Shrimp, read my message above it is a half hardy perennial, meaning it will need to be protected in winter. Mind you I doubt it will keep the cats at bay and certainly not over the winter.