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Calendula officinalis

Calendula

Bright, edible petals and open flowers bring color and insect visitors to a cool-season food garden.

Grows in Zones 4–12Growing guide
Calendula growing or ready to harvestPhoto: Hope Duckworth · CC BY 4.0

Set your expectations

When will it bloom?

Usually 6–10 weeks from seed to first flowers
Cold-weather noteUse local frost dates and protect young plants from hard freezes.
Start withSeeds or nursery transplants
Life cycleCool-season annual
DifficultyEasy to moderate

Your seasonal plan

When to grow calendula in Zone 6.

The flower row shows when established plants may bloom. Leave some flowers for insects and adjust planting to your local frost dates. These are useful planning windows, not exact weather guarantees.

Typical planting windowMarch–April and August–September
Typical bloom windowJune–September

Growing essentials

What calendula need to thrive.

Use the practical details below with your Zone 6 timeline. Current weather and the variety you choose can shift timing.

LightFull sun; some afternoon shade where summers are hot
SoilAverage, moderately fertile, well-drained soil
Planting depthSow about ¼–½ inch deep; follow the seed packet.
Spacing8–12 inches apart
WaterKeep seedlings moist; water at soil level when the upper soil dries.
Best conditionsMild weather; intense summer heat can reduce flowering.

How to plant

Plant it well.

Sow outdoors around the last spring frost, or start indoors 6–8 weeks before it. Plant in fall where winters are mild and summers are hot.

Indoors or containers

Easy to start under lights; mature plants flower best outdoors in beds or pots.

Keep it growing

Care through the season.

  • Remove faded flowers to encourage new buds; leave a few if you want seed.
What to avoid

Crowding plants or overwatering in hot weather, which can encourage mildew.

Ready to harvest

Know the cue, not just the date.

  • Pick fully opened flowers after dew dries. Use petals from correctly identified, food-safe plants; avoid flowers treated with products not approved for edible crops.

How we know

Sources and growing guidance.

The growing essentials and seasonal planning windows are original summaries informed by university Extension references; always adjust for current local weather and variety instructions.

Calendula: plant profile and cultivationNorth Carolina State ExtensionFlowers in the vegetable gardenUniversity of Illinois Extension

Extension sources checked · November 2026. Seasonal windows are planning estimates.