In Japan, Actinidia polygama (silver vine) is noted for having an effect on cats much like that of catnip. It is mentioned in the saying 'Silver vine to a cat, a coin to a prostitute', meaning to put someone in a good mood by providing that which they most desire.
Perhaps its the same as Catmint below?
The main active ingredient is an essential oil called Nepetalactone in the leaves and stem of the plant they are quite a few other ingredients including Tannin.
When a cat encounters Catmint it usually sniffs it, rolls in and rubs against it, licks it and then eats it. It's actually the sniffing that produces the high, they bruise the catnip to release the Nepetalactone. It produces quite a high in my cat, when sniffed, Catmint is a stimulus but when eaten it will act as a sedative.

thank you, I now know that jeyes fluid on used tea bags and a thick layer of shingle round the roots should help to deter the cats.Re question on Actinidia kolmikta yesterday.

I find pepper works to till it rains.