Growing Calendula: A Complete Profile
By Growing Home Greens Team · July 18, 2026
Calendula is one of the earliest things you can get in the ground. It tolerates a light frost and is often started before most of the garden is even planted, and it earns its keep once established, commonly reported to draw in the predatory insects that prey on tomato hornworms. What you get for the trouble is a low, 12- to 18-inch mound covered in simple daisy-like blooms in orange or yellow.
Getting it in the ground before anything else
Calendula can be started indoors 7 weeks before last frost or direct-sown as early as 2 weeks before that date, earlier than nearly anything else in a flower bed. It matures fast, in around 50 days, and packs in at one plant per square foot. It’s a cool-season plant at heart: expect it to slow down and stop flowering well once summer heat sets in, which is normal rather than a sign of a problem.
Midsummer heat slows it, but doesn’t kill it
Calendula that stops blooming in midsummer heat isn’t dying, it’s just doing what cool-season annuals do. Deadhead it, keep it watered, and it will often pick back up as temperatures ease in fall. Powdery mildew can show up late in the season on stressed or crowded plants; spacing and morning watering (not evening) help keep it in check.
A hornworm-predator draw for the tomatoes
Calendula is commonly reported to help attract predators of tomato hornworms, which is why it’s a frequent pairing near tomatoes. See the full companion guide for calendula. Its dense, one-per-square-foot habit and early planting window make it a good filler in the Garden Designer for beds that won’t be fully planted until after last frost.
Companion planting guide for Calendula · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Calendula tolerates either.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Calendula plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Varieties worth considering
- 'Pacific Beauty': Utah State University Extension notes this variety, along with 'Coronet', has increased heat tolerance compared to other calendula, useful if your garden runs warmer than calendula's preferred cool-season range. (source)
- 'Resina': Utah State University Extension notes this variety has high resin content in the blooms, the pick specifically if you're growing calendula for its traditional medicinal/skin-care use rather than as a cutting or bedding flower. (source)
- 'Erfurter Orangefarbige': Also noted by Utah State for high resin content, alongside Resina. A second option in that same high-resin category if Resina specifically isn't available where you buy seed. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy calendula seeds
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews. See the sources cited on each item.
See it growing
Search YouTube for "growing calendula" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Calendula: A cool-tolerant, edible-flowered annual planted early to draw in the predatory insects that help control tomato hornworms.
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