Perennial
Blue Mistflower
Conoclinium coelestinum
Varieties We Carry
StandardConoclinium coelestinum
Sizes & Pricing
1 galFrom$9.95
Fresh this week. Last restocked Mar 9.
LightFull Sun, Part Shade
WaterModerate
Mature size1.5-3 feet × 2-3 feet (spreading clumps)
About Blue Mistflower
Blue Mistflower (Conoclinium coelestinum), formerly Eupatorium coelestinum, is a native perennial of eastern North America producing fluffy, ageratum-like clusters of lavender-blue flowers on branching stems in late summer and fall. It spreads by rhizomes to form colonies and is an exceptional late-season nectar plant for butterflies and native bees. Starting at $9.95.
Plant details
- Bloom Season
- Summer, Fall
- Flower Color
- Purple, Blue
- Growth Rate
- Fast
- Foliage
- Deciduous
- Soil
- Sandy, Loam, Well-drained, Wet
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
New foliage emerges. Good planting window.
Bloom season. Higher water demand in summer heat.
Bloom season. Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Plant Blue Mistflower in full sun to part shade; in Northeast Florida's intense summer heat, afternoon shade reduces stress and keeps foliage looking its best through the long growing season.
Water
Water regularly to keep soil consistently moist, especially during dry spells; once established, this Florida native tolerates brief drought but performs best with moderate, even moisture. It naturally grows along moist edges and tolerates wet feet.
Soil & Fertilizer
Adaptable to a wide range of Florida soils — sandy, loamy, or moist low spots. No heavy fertilization needed; a light application of balanced slow-release fertilizer in spring is sufficient. Divide clumps every 2–3 years to control spread and maintain vigor.
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Common questions
Is Blue Mistflower a good plant for St. Augustine?
Blue Mistflower is a perennial for Zone 9b coastal Florida gardens, with low salt tolerance, reaching 1.5-3 feet × 2-3 feet (spreading clumps).
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.