1. Rosemary - sprinkle sprigs of this around your yard or in your garden beds (said to also ward off aphids and mites).
2. Artemesia - a lacy, silvery plant that repels ticks, fleas, and moths. Also used to make tea.
3. Garlic - fleas and ticks and even deer greatly dislike the smell and taste of garlic. Crush it and spread it around the perimeter of your yard to ward off undesirables.