Spray vinegar on ant trails and around the areas they are getting into your house. Place sprigs of pennyroyal, tansy, or rue in the cupboards and shelves.
Fleas hate laurel leaves, rue, and winter savory. Crush and place under rugs, sofa cushions, doormats, etc.. Add a tsp. of vinegar to your pets drinking water.
Hang sprigs of lavender, mint, pennyroyal, peppermint, or rue. Make potpourris out of lavender. Grow any one of these herbs in and / or outside of your house.
Make sachets out of lavender, lemon, thyme, mint, rosemary, tansy, or wormwood. Place in linen closets and drawers and in closets.
Place bay leaves on shelves and in cupboards. Put a whole leaf in with your flour, rice and dried beans.
Place sprigs of tansy or mint on your shelves, cupboards and anywhere mice have been seen to deter them.