How to Grow Calendula From Seed (Plus Harvesting & Drying)
Calendula is one of the most forgiving flowers you can grow from seed — a cheerful, cold-hardy annual that germinates quickly, tolerates poor soil, and keeps blooming from early summer until a hard frost. Sow it once, deadhead it now and then, and a single planting will hand you golden flowers for months. It is a favourite on our farm for exactly that reason: generous, undemanding, and useful long after the season ends.
This guide covers growing calendula from seed start to finish — when to sow, how to space and care for it, and how to harvest and dry the flowers so you can use them later. At La Ferme À Ciel Sur Mer we grow calendula (Calendula officinalis, also called pot marigold) as a certified Organic herb in Charlevoix, Quebec, so the timings here are what we use in a cold-winter climate. If you'd rather buy flowers already dried, see our guide to calendula benefits, uses and where to buy dried flowers.
Is Calendula Easy to Grow?
Yes — calendula is often recommended as a first flower for new gardeners and children. It is an annual that grows readily from seed sown straight into the garden, shrugs off light frost, and is untroubled by lean soil. Give it sun and a little water while it establishes and it largely takes care of itself. It also self-seeds happily: leave a few flowers to mature and you'll often find volunteer plants the following spring.
When to Sow Calendula Seeds
Calendula tolerates cool weather, so you have some latitude. You can direct-sow outdoors a couple of weeks before your last spring frost, since the young plants handle a light chill. In a cold climate like ours, we sow once the worst of the frost has passed, or start a few trays indoors about four to six weeks before the last frost for earlier blooms. For a long, uninterrupted season, make two or three successive sowings two to three weeks apart — this keeps fresh flowers coming right through to autumn.
How to Grow Calendula From Seed: Step by Step
- Choose a sunny spot. Calendula flowers best in full sun but tolerates part shade. Almost any well-drained soil will do — it doesn't need rich ground.
- Sow the seed. Sow about 1 cm (¼ in) deep, spacing seeds roughly every few centimetres. The curved seeds germinate best in darkness, so cover them lightly. Direct-sow outdoors, or start indoors in trays.
- Keep moist to germinate. At about 15–21 °C (60–70 °F), seedlings usually appear within one to two weeks.
- Thin the seedlings. Once they're up, thin or transplant to stand about 20–30 cm (8–12 in) apart. That spacing gives good airflow and room to bush out.
- Water while establishing. Keep young plants watered; once established, calendula is fairly drought-tolerant. Avoid waterlogged ground.
- Expect blooms in 6–8 weeks. From sowing, the first flowers usually open about six to eight weeks later and continue for months with regular picking.
Caring for Calendula: Deadheading for More Blooms
The single most useful habit is regular deadheading — removing spent flowers before they set seed. Left to go to seed, plants slow down and stop flowering; picked or deadheaded every few days, one planting will bloom for months. Happily, harvesting flowers to use is deadheading, so a plant you pick from regularly is a plant that keeps producing. Calendula rarely needs feeding or staking; keeping the bed weeded and picked is most of the work. It also earns its keep as a garden companion, a role we cover in the magic of calendula.
How to Harvest Calendula Flowers
Pick the whole flower head at full bloom, when the petals are open and the back of the head feels tacky with resin — that stickiness is a good sign of the aromatic, resinous compounds concentrated in the flower. Harvest on a dry morning once the dew has lifted. Because the plants flower continuously, plan to pick every two to three days at peak season; on our farm that steady cadence is how we keep both the harvest and the bloom going. Snap or snip the heads off, leaving the plant to push out more.
How to Dry Calendula for Storage
Drying lets you keep the harvest for tea, oils and salves through the year:
- Harvest whole flower heads at full bloom, after the dew has dried.
- Spread them in a single layer, not touching, on a screen or tray — good airflow matters because the resinous centres hold moisture.
- Dry in a warm, dark, well-ventilated spot for one to two weeks, or use a dehydrator on low. They're ready when the heads are papery-dry and the centres are no longer soft.
- Store whole in an airtight jar, away from light and heat, and label it with the harvest date. Drying whole and crumbling later best preserves colour and aroma.
Once dried, your flowers are ready to become an infused oil or a salve — see how to make calendula oil and our calendula salve recipe. If your own patch falls short, we sell certified Organic whole dried calendula flowers grown on our farm.
Saving Calendula Seeds
Seed-saving couldn't be simpler. Let some flowers fade and dry fully on the plant — the heads curl into rings of hooked, beige seeds. Once they're dry and brown, rub them free over a bowl and store the seed somewhere cool and dark. Calendula also self-sows readily, so a patch left to drop a little seed will often reappear on its own the next spring.
Frequently Asked Questions
How long does calendula take to grow from seed?
Seeds usually germinate in one to two weeks, and plants typically produce their first flowers about six to eight weeks after sowing, then bloom for months with regular picking.
Can you sow calendula seeds directly in the ground?
Yes. Calendula is easy to direct-sow. Sow about 1 cm deep from a couple of weeks before your last spring frost onward, since young plants tolerate light frost, and thin to 20–30 cm apart.
Does calendula come back every year?
Calendula is an annual, so individual plants don't overwinter in cold climates. However, it self-seeds readily — if you let a few flowers set seed, volunteer plants often return the following spring.
How do you get calendula to keep blooming?
Deadhead regularly. Removing spent flowers before they set seed pushes the plant to keep producing. Harvesting flowers to use counts as deadheading, so frequent picking keeps a planting in bloom for months.
When should you harvest calendula flowers?
Pick whole flower heads at full bloom on a dry morning, when the back of the head feels tacky with resin. Plants flower continuously, so harvest every two to three days at peak season.
How do you dry calendula flowers?
Spread whole heads in a single layer with good airflow and dry in a warm, dark, ventilated spot for one to two weeks, or use a dehydrator on low. Store airtight, away from light, labelled with the date.
Want to learn more? Explore the rest of our calendula guides:
- Organic Calendula: Benefits, Uses & Where to Buy Dried Flowers
- How to Make Calendula Oil
- Calendula Salve: A Gentle Herbal Recipe for Skin Support
Interested in knowing more about what's going on on the farm? Our occasional emails bring you stories from the field, new herbs for sale, and herbal insights. Browse our Organic herbs or sign up for our newsletter to stay connected.