Ashy-leaf cyanthillium Plant Care

Ashy-leaf cyanthillium (Cyanthillium cinereum) belongs to the Asteraceae family within the Cyanthillium genus. Ashy-leaf cyanthillium is native to tropical Africa and to tropical Asia and has become naturalized in Australia, Mesoamerica, tropical South America, the West Indies, and the US State of Florida. Ashy-leaf cyanthillium is also known as Ashy-leaf eupatorium, Little ironweed, Purple-flowered eupatorium.

Ashy-leaf cyanthillium displays a low rosette, spreading growth habit, reaching up to 2 ft tall with a spread of approximately 1 ft. Ashy-leaf cyanthillium produces small daisy-like flowers in shades of pink, purple, or white.

Leaf size: approximately 2 inches.

Cyanthillium cinereum requires watering every 3–5 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Ashy-leaf cyanthillium thrives in full sun to partial shade.

Cyanthillium cinereum grows best at temperatures of 65–80°F. Ashy-leaf cyanthillium prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining sandy loam with added organic matter. Good drainage is essential for Ashy-leaf cyanthillium to prevent waterlogging, which leads to root rot and fungal issues.

Feed Ashy-leaf cyanthillium every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Repot every 1-2 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Ashy-leaf cyanthillium can be propagated through seeds, division of clumps.

See all plants toxic to cats and plants toxic to dogs.

Ashy-leaf cyanthillium is susceptible to aphids, spider mites, whiteflies. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Ashy-leaf cyanthillium grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Ashy-leaf cyanthillium is native to tropical Africa and to tropical Asia and has become naturalized in Australia, Mesoamerica, tropical South America, the West Indies, and the US State of Florida. In cooler regions, grow Ashy-leaf cyanthillium as a houseplant or bring it indoors before the first frost.