Try pheromones
Feliway is a manmade version of the odourless pheromone normally left by cats when they rub against objects in their environment. This pheromone is usually released by your cat when he or she feels happy or content and is also used to mark territory. When used correctly, Feliway can help to reduce your cat's stress levels and combat marking behaviours like scratching or spraying.
If your cat is scratching inappropriately at multiple around the home, the Feliway Diffuser should be used in the room where your cat spends the most time. If scratching occurs in just one particular area, then the Feliway Spray can be used to spray just that area. The Spray can also be used in addition to the Diffuser if required.
If using the Feliway Spray, it is important that you do not spray the areas where you want your cat to scratch, such as scratching trees and posts. Spraying these areas will prevent your cat from using them!
Want to know more? Take a look at Your Guide to Using Feliway.