Planting mint around the outside of the house can help to keep spiders and other bugs from entering. You can also dry out mint and place it in bunches inside the home to repel spiders around windows and doors. For landscaping purposes, mint also provides excellent ground cover, and it quickly spreads itself over large areas. You can also use mint in cooking, homemade potpourri and even summertime drinks.
Lavender smells pleasant to humans but not to spiders and several other bugs such as spider mites, fleas or beetles. As with mint, you can grow lavender in the yard to keep spiders at bay as well as dry it for use inside the home. If you are not a green-thumb gardener, lavender essential oil makes a good substitute. Add the oil to homemade potpourri or mix it with soap and neem oil to create a powerful repellent spray for windowsills, vents and thresholds.
Lemon oil, and commercial cleansers that contain it, helps to repel spiders. You can place some around windowsills or other entryways such as doors and vents or add it to cleansers used to mop floors and clean windows to make the home unattractive to spiders and other pesky bugs such as fleas, ants and cockroaches.
Placing chestnuts throughout a home can keep spiders from wanting to live with you. Homeowners living in areas where chestnuts are available can set the chestnuts in windows and sliding door tracks, inside vent shafts and even inside walls where spiders often nest.