Calendula
金盏花 Calendula officinalis · Asteraceae
A cut-and-come-again flower: the more you pick, the more it produces.
The deadhead loop
Calendula is a loop, not a single crop. An open flower picked promptly sends the plant back into flower; a spent flower left to set seed tells it to stop. The loop is simple: pick, pick, pick, then let a few late heads ripen if you want seedlings next year.
The seed heads are curved and knobbly, like tiny caterpillars. Let them dry on the plant, then pull them apart into a paper bag. In mild climates, autumn-sown plants flower earlier the following year; in cold ones, sow in spring.
| Stage | What to do | Why |
|---|---|---|
| Flower fully open | Pick with a short stem | Encourages more buds |
| Spent flower | Deadhead promptly | Stops seed set |
| Ripe seed head | Dry and save | Next year's plants |
| Late season | Leave a few heads | Self-sowing |
Growing it
NC State Extension describes calendula as an annual grown in full sun, in average, well-drained soil (NC State Extension). It tolerates poor soil and part shade, though full sun gives the most flowers. Sow direct in spring, 1 cm deep, once the soil has warmed.
Keep the plants watered in dry spells and deadhead regularly. If you want it to self-sow, leave a few flower heads to ripen at the end of the season. In mild climates, autumn-sown plants flower earlier the following year.
Harvest and drying
Pick the flower heads on a dry morning, as soon as they are fully open. Use scissors and leave a short stem. Harvest every few days; the more you pick, the more the plant produces.
Dry the heads whole in a single layer in a dark, airy room. They are resinous and sticky, so turn them gently and do not pile them up. Store in an airtight jar away from light. The petals can also be separated and dried.
- Pick fully open heads on a dry morning.
- Harvest every few days.
- Dry in a single layer; turn gently.
- Store airtight, away from light.
Identifying it
Calendula has soft, pale green, lance-shaped leaves and composite flowers with a single ring of ray petals around a central disc. The seed heads are curved and knobbly, like tiny caterpillars.
It is not the same as French or African marigolds (Tagetes), which have feathery leaves and a different scent. Calendula is the pot marigold; Tagetes is the ornamental marigold.
Traditional context
Calendula has a long history as a garden flower, a culinary petal and a traditional skin herb. The petals are used in salads and broths for colour, and the flowers are used in oils and salves.
MSK advises against taking calendula during pregnancy or breastfeeding because it has not been studied, and notes allergic reactions in people sensitive to the daisy family. This page covers growing and drying, not making a medicine or treating a skin condition.
Cautions
Safety notes for calendula
- Do not take calendula during pregnancy or breastfeeding; safety has not been studied (MSK).
- Asteraceae allergy is common; avoid if you react to daisies, ragweed or chamomile (PFAF).
- Topical use may cause rash or contact dermatitis in sensitive people (PFAF).
- Use only the petals and flower heads in food; do not eat the green base or stems.
- This is horticultural information, not medical advice or a dose recommendation.
A starting point for a conversation with a qualified practitioner or pharmacist — not a diagnosis, dose or treatment plan. See the full safety page.
Questions this plant raises
Does calendula come back every year?
It is an annual, but it self-sows reliably. Leave a few flower heads to ripen and you will usually have plants again next spring.
Why are my calendula flowers small?
Crowding and dry soil are the usual causes. Thin the plants, water regularly, and keep picking to encourage new buds.
Can I eat the whole flower?
The petals are the culinary part. Remove the bitter green base before using the flower in food.
Sources & further reading
- NC State Extension — Calendula officinalisNC State Extension
- Plants for a Future — Calendula officinalisPFAF
- Memorial Sloan Kettering — CalendulaMSK
Accessed for horticultural and safety context. Traditional-use statements are historical and are not evidence of effectiveness. Written and edited by the Herb Ledger editorial team. Read the editorial policy.
More flowers & flowering tops
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