Calendula officinalis
Taxonomy
Domain: Eukaryota
Kingdom: Plantae
Subkingdom: Tracheobionta
Superdivision: Spermatophyta
Division: Magnoliophyta
Class: Magnoliopsida
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Calendula
Species: Calendula officinalis
Common Names by Region
- United States / Canada: Pot marigold, calendula, English marigold, common marigold, ruddles
- United Kingdom / Ireland: Pot marigold, marigold, Scotch marigold
- Continental Europe: Local-language equivalents — e.g., German Ringelblume (“little ring flower,” for the curled seeds), French souci
- General: Calendula
Description
Quick ID
- Growth form: Bushy annual (sometimes short-lived perennial in mild climates), roughly 1–2 feet tall, on branching, slightly sticky, hairy stems.
- Flowers: Daisy-like composite heads roughly 2–3 inches across. This is a single form — a ring of strap-shaped orange ray florets around a slightly domed orange-yellow disc. Colors range from pale yellow through gold to deep orange across cultivars.
- Seed head — the namesake feature: Seeds are curved, ridged, and arranged in a distinctive curled ring or crescent, like a little crown or clock face. The drying ring at the upper left of this photo is exactly that — the “calendar” the genus name refers to.
- Leaves: Oblong to spoon-shaped, slightly hairy, aromatic, and clasping the stem. Softly sticky to the touch.
- Habit note: Flowers respond to light — heads open in the sun and close in dull weather and at night.
Blooming
- Long season, late spring through fall, and famously persistent — it often flowers right up to hard frost, and in mild winters barely stops. The old genus lore held that it bloomed on the calends (first) of every month.
Look-alikes
- “Marigolds” of the genus Tagetes (French and African marigold): The big source of confusion. Those are the pungent bedding-plant marigolds with ferny, strongly scented, divided leaves and tight double pompons. Calendula is a different genus — milder-scented, simpler-leaved, and the one used in the kitchen and apothecary. Same common word, unrelated plant.
- English daisy, gazania, and other orange composites: Separated by Calendula’s clasping hairy leaves and, decisively, that curled ring of seeds.
Known Range
- Origin: Southern Europe and the Mediterranean; the wild ancestor isn’t cleanly known, as it’s been in cultivation so long. Not truly wild anywhere in the modern sense.
- In cultivation: Grown worldwide as a garden annual, culinary herb, and medicinal plant. Common throughout the United States, including Pennsylvania gardens. It self-sows readily and can persist as a garden escape on disturbed ground, but it doesn’t aggressively naturalize here.
Care / Habitat
Light
- Full sun for best flowering; tolerates light shade.
Soil
- Undemanding. Well-drained average soil is plenty; tolerates poor ground. Dislikes soggy roots.
Water
- Moderate. Reasonably drought-tolerant once established.
Cool-season note
- Calendula is a cool-weather flower. It does its best work in spring and fall and often sulks or stops in high summer heat, picking back up as things cool — which is why it’s a signature late-season bloomer.
Typical Habitat (when cultivated)
- Vegetable gardens, herb beds, borders, containers, and cottage plantings. A traditional companion plant among vegetables.
Propagation / Reproduction
- Seed, and easy from it. Direct-sow in spring (or fall in mild areas); germinates readily in cool soil.
- Self-sows freely — one planting usually returns on its own year after year.
- Deadheading extends bloom and keeps the plant tidy; leaving heads to dry gives you both seed and the ornamental curled rings.
Pests / Diseases / Threats
- Powdery mildew in humid, crowded conditions; aphids and whiteflies on new growth.
- Occasional fungal leaf spot in wet spells.
- Otherwise tough and trouble-free. Not weedy or invasive.
- Sometimes planted deliberately as a trap crop — aphids and other pests will gather on the calendula and spare nearby vegetables.
Additional Notes
Ecology & Use
- A strong pollinator plant with a long bloom season; the open single forms (like this one) feed bees and hoverflies far better than tight doubles do.
- Culinary: the petals are edible — the original “poor man’s saffron,” used to color and flavor butter, cheese, rice, soups, and custards, and scattered fresh over salads.
- Medicinal: one of the oldest and best-known herbal plants. Calendula-infused oils, salves, and washes have a long tradition for soothing skin, minor wounds, and inflammation, and the plant remains a staple of modern herbalism and natural skincare. (The species epithet officinalis literally marks it as a plant “of the apothecary.”)
- Dye: the flowers yield a yellow dye for cloth.
- A genuine multi-purpose cottage-garden plant: ornamental, edible, medicinal, and pollinator-friendly all at once.
Management
- Want more? Deadhead through the season, then let a few heads dry and drop seed — it’ll reseed itself.
- Want the best of it? Grow it in the cool shoulders of the season, spring and fall, when calendula is at its happiest.
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