Plant Profile: Ageratum houstonianum

This herbaceous annual, which is sensitive to frost, typically grows to a height of 0.5 to 1 foot and forms mounds adorned with clusters of fluffy, aster-like blooms. For optimal growth, it should be spaced 10 to 12 inches apart. The genus name is derived from the Greek words "a," meaning not, and "geras," meaning old age, reflecting the flowers' ability to retain their vibrant color for an extended period.

From May to October, this plant creates clumping mounds featuring pink, white, and blue flowers, making it a reliable choice for annual blooms. It is often mistaken for ageratums, which are perennials characterized by tall, upright stems and widely spaced leaves, yet they share a resemblance in foliage and flowers.

This species exhibits moderate drought resistance but thrives best in rich, moist, well-drained soil and full sunlight. It is suitable for both garden beds and containers, flowering from spring until frost. Taller varieties are excellent for cutting, and the plant is rarely affected by rabbits or deer. It can be effectively used for edging or as a low massing plant in garden beds and is generally free from pests and diseases.

Potential issues include powdery mildew.

Belongs to the Asteraceae (Compositae) family.

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