Citrus Rinds as Protectors in Soil

Bury citrus rinds in the soil of your house plants to keep cats from digging. Orange, grapefruit, lemon, lime rinds are all unpopular with felines.
You can do this for your outdoor garden as well to prevent the neighborhood cats from treating your garden as the litter box.
Be aware that the rinds will break down into the soil (composting) so you will need to replace them from time to time.