Diverticulitis is bad enough by itself, causing discomfort and inflammation throughout the colon, but the condition becomes even worse when it becomes infected. Garlic is a powerful herb that is used in countless home remedies, and for the treatment of diverticulitis, its antioxidant and antiseptic properties help you stay healthy. It also has anti-inflammatory effects, which can speed the healing process and get you feeling back to normal sooner. Garlic can be taken in many forms, ranging from adding garlic to your meals to garlic extract, which is available at most health food stores.