Marigold has been used for years because of its multiple benefits. calendula marigolds contain many active constituents, including various antioxidants and volatile oils. These are responsible for the flowers’ bright color and strong smell; ability to repel certain fungi, pests and insects; and also, its capability of improving blood flow and controlling inflammation. Uses of Marigolds Calendula Homemade Skin Treatment : Ointment can be used to soothe burns, warts, bites, acne and ulcerations, in addition to healing wounds, dry skin and blisters. Digestive-Soothing Tea : Tea can be made with marigold flowers to lower symptoms caused by inflammatory bowel diseases/colitis.