Calendula, commonly called marigold, has been used medicinally across Europe since antiquity, though it rose to particular prominence in medieval times, when its bright orange-yellow petals were used both as a dye and a wound remedy in monastery gardens across Europe. Its genus name "Calendula" derives from the Latin "calendae," referring to the first day of the month, since the plant was observed to bloom on nearly every calendar month in Mediterranean climates.
Calendula saw a notable resurgence in wound care during the American Civil War and World War I, when it was used as a field antiseptic and to promote wound healing when modern antibiotics didn't yet exist. This practical battlefield use is part of why it remains one of the most common ingredients in modern natural skincare and wound-care products today.
Calendula's evidence base for wound healing is genuinely inconsistent depending on the type of wound, and it's worth being specific rather than giving one blanket rating. For venous leg ulcers, a couple of clinical control studies found calendula extract reduced ulcer surface area compared to controls — a real positive signal. A randomized trial specifically on acute hand wounds (cuts and skin loss treated by secondary intention) also found favorable results using standardized calendula extract.
However, results for other wound types are much less consistent: a randomized trial found no improvement for calendula in diabetic leg ulcer healing, and a trial in burn patients found no benefit for topical calendula compared to standard care. Studies on preventing radiation-induced skin damage during cancer treatment are similarly split — one trial found improvement, another found none. A 2019 systematic review concluded there is "some evidence" supporting calendula consistent with its traditional use, but explicitly called for larger, better-designed trials given how mixed the current picture is.
Petals infused into oils or ointments for topical use, or brewed as tea. Calendula-infused oil remains one of the most common traditional preparations, made by steeping dried petals in a carrier oil over several weeks.