Found this on a web page........There is a new garden plant, Coleus canina, on the market. It is marketed under the names Pee-off and Scaredy-cat. This plant has a pungent odour that is said to repel cats and other mammals from the garden .........[url]http://www.rspb.org.uk/advice/gardening/unwantedvisitors/cats/catdeterrents.asp...... also have a look at this site ......
http://www.cat-repellant.info/html/d............ hope they help
Denis