Lavender is common in most households, whether in your cleaning products or your essential oil diffuser. This might have you wondering, how safe is lavender for cats? Lavender is not safe for cats to ingest. Depending on how much a cat has ingested, the symptoms can range from just an upset stomach to liver damage and central nervous system problems. Due to the lavender in common household cleaning products being too dilute to do any real harm, there is often no reason to worry. However, this is not the case with lavender essential oils, lavender plants, and lavender potpourri. These are dangerous for your kitty to ingest and should be kept away from your kitty or avoided altogether. Dangerous amounts of essential oils are often in homemade cleaning products, essential oils that you put into a diffuser, body lotions, and potpourri.