You can use this oil in salad dressings, or even as an ingredient in salves, massage oils, lip balms, creams, and lotions.
1. Fill a glass canning jar ⅔ of the way full with dried calendula flowers. If using fresh calendula, wilt for 12 hours to remove most of the moisture (too much moisture will cause the oil to go rancid) before adding to the jar.
2. Pour olive oil into the jar, making sure to cover the flowers by at least one inch with oil so they will have space to expand. Stir well and cap the jar tightly.
3. Place the jar in a warm, sunny windowsill and shake once or more daily. After about a week, strain the herbs out using cheesecloth. Pour the infused oil into glass bottles and store in a cool, dark place.