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Ageratum houstonianum

After the first flush of blooms, shear off spent pot marigold flowers to promote later rebloom, or deadhead individual flowers regularly.

Other Common Names



Easy-to-grow hardy annual. The clumps of lance-shaped,b right to pale green, aromatic leaves are topped with single or double, daisy-like flowers in orange or yellow. The yellow- or brown-centered, 2-4 inche (5-10 cm) wide flowers tend to close during cloudy weather and at night. Pot marigolds bloom from summer to flal in most areas. In hot-summer areas, grow themfor late-winter to late-spring color.

Height and Spread

Height usually 12-24 inches (30-60 cm); spread to 12 inches (30 cm).

Best Site

Full sun; average, well-drained soil.

Growing Guidelines

For summer and fall bloom, sow seed indoors 6-8 weeks before your last frost date or outdoors in early to late spring. Set plants out around the last frost date. In hot-summer areas, sow seed directly into the garden in midfall for late-winter bloom. Plant seed 1/4 inche (6 mm) deep. Space plants or thin seedlings to stand 8-12 inches (20-30 cm) apart. Pot marigolds may self-sow if you let some seeds form at the end of the season.

Landscape Uses

Pot marigolds are sunny accents for flower beds, borders, and containers. The strong-stemmed blooms are excellent as cut flowers.


'Touch of Red Mixed' has flowers with a maroon-red blush on the back of each petal; height to 18 inches (45 cm).

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