Calendula

Overview

Calendula, sometimes called pot marigold, is not the same genus as common Tagetes marigolds. Its yellow-to-orange flower heads appear quickly from seed.

It handles cool spring and fall conditions well but may slow or decline in intense summer heat. A later sowing can provide a renewed fall crop.

Growing conditions at a glance

Life cycle

Cool-season annual that often self-sows

USDA zones

Grown as an annual across USDA zones 2–11

Sun

Full sun; afternoon shade can extend bloom in hot areas

Soil

Average, moderately fertile, well-drained soil

Soil pH

Adaptable; roughly 6.0–7.0 is a practical target

Water

Water deeply when the top inch dries; avoid chronic drought during flowering

Spacing

8–12 inches

Germination

Typically 5–15 days; sow about 1/4 inch deep

How to plant calendula

1. Direct sow shortly before or around the last frost, or start indoors 6–8 weeks earlier.
2. Thin seedlings before leaves overlap heavily.
3. Deadhead frequently to keep buds forming.

Growing from seed

• Use individual cells if starting indoors to reduce root disturbance.
• Provide cool, bright conditions after emergence.
• Make a late-summer sowing where fall weather is mild.

Growing in containers

Use a 10–12 inch deep container with drainage. Compact cultivars are easiest; regular deadheading keeps the display productive.

Harvest, dry and store

Harvest

Pick newly opened flower heads after dew dries. Harvesting every few days encourages continued bloom.

Drying

Separate petals or dry whole heads in a single layer with strong airflow. Thick centers take longer than petals.

Storage

Store completely dry material in an airtight container away from light. Discard anything that develops softness, condensation or off odor.

Common problems and useful companions