Eupatorium coelestinum3.jpg. by KENPEI. CC BY 3.0. via Wikimedia Commons
CC BY 3.0 · Wikimedia Commons
Blue Mistflower Plant Care
Eupatorium coelestinum L.
Conoclinium coelestinum, the blue mistflower, is a North American species of herbaceous perennial flowering plant in the family Asteraceae. It was formerly classified in the genus Eupatorium, but phylogenetic analyses in the late 20th century research indicated that that genus should be split, and the species was reclassified in Conoclinium.[2]
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
What Is the Blue Mistflower?
Blue Mistflower (Eupatorium coelestinum) belongs to the Asteraceae family within the Eupatorium genus. Blue Mistflower is also known as Conoclinium dichotomum, Conoclinium flaccidum, Conoclinium nepetifolium.
Blue Mistflower displays an upright, bushy perennial growth habit, reaching up to 3 inches tall with a spread of approximately 2 inches. Blue Mistflower produces clusters of small, fluffy white or pink flowers.
Leaf size: approximately 6 inches.
How Often Should You Water a Blue Mistflower?
Eupatorium coelestinum requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Blue Mistflower Need?
Blue Mistflower thrives in full sun to partial shade light conditions. The optimal light range is 200–1000 lux. Avoid placing Blue Mistflower in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Full sun to partial shade
200–1000 lux
What Temperature and Humidity Does the Blue Mistflower Prefer?
Eupatorium coelestinum grows best at temperatures between 60°F and 80°F. Blue Mistflower prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Blue Mistflower?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Blue Mistflower to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Blue Mistflower?
Repot every 2-3 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.
How Do You Propagate a Blue Mistflower?
Blue Mistflower can be propagated through seeds, division of rootball. Similar propagation techniques also apply to boneset plant care, which shares the same genus.
Fertilizing
Every 4 months
During the growing season
Is the Blue Mistflower Toxic to Pets and Children?
Non-Toxic
Non-toxic to humans and pets
What Pests and Diseases Affect the Blue Mistflower?
Blue Mistflower is susceptible to aphids, spider mites, powdery mildew. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
What USDA Hardiness Zone Does the Blue Mistflower Need?
Blue Mistflower grows outdoors in USDA Zone 13a. In cooler regions, grow Blue Mistflower as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Blue Mistflower is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Eupatorium genus — compare its care with other Eupatorium species on PlantoScan.
Blue Mistflower tolerates low-light rooms and shaded spots — browse the full list of low-light plants.
More Eupatorium Species
Other Eupatorium species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
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