Calendula (Calendula officinalis) is the plant that most herbalists describe as the first herb to grow if you can only grow one. It is extraordinarily easy to grow from seed, flowers prolifically from early summer through first frost (giving it one of the longest harvest seasons of any medicinal plant), and has applications across multiple body systems that make it one of the most broadly useful herbs in the home apothecary.
Growing It
Calendula is direct-sown in April in most temperate climates: press the large, curved seeds about 1cm deep into moist soil or compost, spaced about 20cm apart, and they germinate within a week or two in reasonable conditions. They are unfussy about soil and do well in both beds and pots. Once established they need little attention beyond deadheading (removing the spent flowers, which prolongs blooming dramatically) and occasional watering in very dry conditions.
The more you pick, the more they flower. A calendar of daily harvest through summer and early autumn produces an extraordinary quantity of dried petals and whole flowers for the apothecary. Dry them quickly at low temperature in a dehydrator or on a screen, and store in airtight jars away from light.
What Calendula Does
The flowers are anti-inflammatory, antimicrobial, vulnerary (wound-healing), lymphatic, and mildly immune-modulating. As a topical preparation, calendula-infused oil (dried petals infused in a carrier oil for four to six weeks) is one of the finest and most versatile preparations in the home apothecary: it soothes, heals, and protects skin with a gentleness appropriate for sensitive skin, babies, and any kind of skin irritation or minor wound. Calendula salve, made by adding beeswax to the infused oil, is a classic preparation that belongs in every medicine cabinet.
Internally, calendula tea has a long tradition for gut and lymphatic applications. It is mildly bitter, supporting bile flow and digestive function, and its lymphatic properties make it useful for swollen glands and skin conditions with a component of lymphatic stagnation.
In the Kitchen
Calendula petals are edible and have a long history in cooking: added to rice for color (they have historically been called “poor man’s saffron”), scattered over salads, infused in butter or oil for both culinary and medicinal use. The plant bridges the kitchen and the apothecary more naturally than almost any other herb.
The Herbalist Codex app has the full calendula profile with its phytochemistry, traditional uses, and all the preparation methods in detail. Grow it this year. It will not disappoint.