Photo: KENPEICC BY 3.0via Wikimedia Commonsresized / cropped
Blue Mistflower Plant Care
Conoclinium coelestinum DC.
Updated · Sources · How we source care data
Conoclinium coelestinum, also known as blue mistflower, is a striking plant with clusters of small, fluffy, powder-blue flowers that bloom in late summer and fall. Its vibrant blooms attract butterflies and bees, making it a popular choice for pollinator gardens.
Every 3–5 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Blue Mistflower?
Water Blue Mistflower every 3–5 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
What Is the Blue Mistflower?
Blue Mistflower (Conoclinium coelestinum) belongs to the Asteraceae family within the Conoclinium genus. Blue Mistflower is native to Eastern United States. Blue Mistflower is also known as Blue Boneset, Wild Ageratum, Conoclinium dichotomum.
Blue Mistflower displays a spreading, herbaceous perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Blue Mistflower produces small, fluffy clusters of lavender or purple flowers.
Leaf size: approximately 3 inches.
How Often Should You Water a Blue Mistflower?
Conoclinium coelestinum 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.
Watering Frequency
Every 3–5 days
Let soil partially dry between waterings
What Light Does the Blue Mistflower Need?
Blue Mistflower thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Blue Mistflower Prefer?
Conoclinium coelestinum grows best at temperatures of 50–80°F. Blue Mistflower prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Blue Mistflower?
Moist, well-draining soil with high organic content. Good drainage is essential for Blue Mistflower to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Blue Mistflower?
Feed Blue Mistflower every 6 months 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.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Blue Mistflower?
Divide and repot every 2-3 years in 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 clumps. Similar propagation techniques also apply to betony-leaf mistflower plant care, which shares the same genus.
Is the Blue Mistflower Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Blue Mistflower, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
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.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Blue Mistflower Need?
Blue Mistflower grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Blue Mistflower is native to Eastern United States.
Hardiness Zone
Zone 5a – 9b
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 Conoclinium genus — compare its care with other Conoclinium species on PlantoScan.
Conoclinium is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Blue Mistflower thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Conoclinium coelestinum DC., family Asteraceae (first published in Prodr. 5: 135 (1836)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Blue Mistflower, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: KENPEI, CC BY 3.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 5a – 9b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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