This homemade natural calendula salve recipe is so easy to make and results in a salve with many healing properties. calendula petals are rich in naturally occurring compounds called flavonoids. These compounds are said to have anti-inflammatory, anti-thrombogenic, antidiabetic, anticancer, and neuroprotective effects. The article linked in the post also states that calendula has been used to treat a variety of skin conditions, such as diaper rash, wounds and other conditions.