Calendula flowers are the bright orange and yellow blooms of Calendula officinalis, a plant in the aster (daisy) family that has been used for centuries in skincare, wound healing, and cooking. Often called “pot marigold,” calendula is one of the most widely used medicinal flowers in the world, showing up in salves, teas, tinctures, and even as a natural food coloring. The petals are edible, the plant is easy to grow, and the flowers contain a rich mix of compounds that give them genuine biological activity on skin and tissue.
What the Plant Looks Like
Calendula produces daisy-like flower heads with long, layered petals ranging from pale yellow to deep orange. The leaves are rounded and wide, and the plant typically grows 1 to 2 feet tall as a bushy annual. The flowers open during the day and close at night, a behavior that gave the plant its name (from the Latin “calendae,” referring to the first day of the month, since it seemed to bloom nearly year-round in mild climates).
One important distinction: calendula is not the same plant as the common marigold you see in garden centers. Those are typically Tagetes species, sometimes called French or African marigolds. The two plants are both in the daisy family, but they differ in meaningful ways. Tagetes marigolds have shorter, compact petals, thinner leaves, and a strong, almost pungent smell that’s used to repel deer and rabbits. Calendula looks more like a daisy, has a mild floral scent, and, unlike Tagetes, is edible.
What Makes Calendula Biologically Active
Calendula petals are packed with several classes of compounds that explain why the flower keeps showing up in medicinal products. The three most important groups are carotenoids, flavonoids, and triterpenoids.
The carotenoids, including beta-carotene, lycopene, lutein, and zeaxanthin, are the pigments responsible for the flower’s vivid color. These same compounds act as antioxidants, neutralizing cell-damaging molecules in skin tissue. The flavonoids, particularly quercetin, rutin, and kaempferol, provide additional antioxidant and skin-protective effects. And the triterpenoids, a group of plant compounds found throughout the petals, are the primary drivers behind calendula’s anti-inflammatory and wound-healing reputation.
Wound Healing and Skin Benefits
Calendula’s most studied use is topical wound healing. Animal studies have shown that calendula extract increases collagen production during the early days of wound repair, with treated wounds showing significantly more collagen at both 4 and 7 days compared to untreated controls. A specific compound in the petals, a triterpene called faradiol, stimulates the proliferation and migration of fibroblasts, the cells responsible for building new connective tissue. This means calendula doesn’t just reduce inflammation around a wound; it actively encourages the growth of new skin.
Research has confirmed that calendula extracts have antibacterial properties alongside these tissue-building effects, which is why calendula-based salves and creams are commonly used for minor cuts, burns, dry skin, and diaper rash. Clinical researchers have also been investigating calendula cream for radiation-induced skin irritation in cancer patients undergoing treatment, though large-scale human trial results are still being completed.
Culinary Uses
The petals are the edible part of the flower, and they’ve been used in kitchens for hundreds of years. Early American colonists ground dried calendula petals into a powder and used it to color butter and cheese a rich yellow. Today, whole petals are tossed into salads as a garnish, steeped into teas, or dried and ground to add natural color to rice, soups, and baked goods. The flavor can be slightly bitter or peppery, so it’s worth tasting a petal before adding a handful to a dish. Some people describe it as mildly tangy, while others find it too bitter to enjoy on its own.
Growing Calendula
Calendula is one of the easier flowers to grow from seed. It thrives in full sun and any well-drained soil, and it actually prefers cooler weather. Unlike warm-season marigolds that bloom from late spring through fall, calendula wilts in heat and does best in spring and early fall temperatures.
You can sow seeds directly in the garden just before your last frost date. They germinate in 5 to 15 days. For earlier blooms, start seeds indoors about 6 to 8 weeks before the last frost. Once flowering begins, regular harvesting (picking the flower heads) encourages the plant to keep producing new blooms throughout the season. The flowers dry well and store easily, which is how most people accumulate enough petals for salves or teas.
Allergy Risks and Precautions
Because calendula belongs to the aster family (also called Compositae), people with known allergies to plants in this group, such as ragweed, chrysanthemums, or daisies, have a higher chance of reacting to it. In one patch-testing study of over 400 patients with suspected plant allergies, about 2% showed a contact sensitivity reaction to calendula. That’s a small percentage overall, but the reaction was sometimes accompanied by sensitivities to other natural substances like propolis and fragrances. If you have a history of skin reactions to daisy-family plants, test a small amount of any calendula product on your inner arm before using it more broadly.