Blue Mistflower (Coelestinum)

The Blue Mistflower (Coelestinum) is generally described as a perennial forb/herb. This is native to the U.S. (United States) has its most active growth period in the summer . The greatest bloom is usually observed in the summer, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Blue Mistflower (Coelestinum) has a moderate life span relative to most other plant species and a moderate growth rate. At maturity, the typical Blue Mistflower (Coelestinum) will reach up to 3.2 feet high, with a maximum height at 20 years of 0 inches.

The Blue Mistflower (Coelestinum) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by seed, sprigs. It has a moderate ability to spread through seed production and the seedlings have medium vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -13°F. has medium tolerance to drought and restricted water conditions.

Uses of : Landscaping, Medicinal, Culinary, etc.

This plant is used mainly for landscape beautification. It has potential for use in cultivated, garden situations, in naturalized prairie or meadow plantings, and along roadsides.

General Characteristics

Sunflower Family (Asteraceae). Mistflower is an erect (to 3 feet), rhizomatous perennial, often forming colonies. It is a U.S. native. The opposite leaves are oval-shaped, hairy, and have toothed edges. The small flower heads are clustered at the top of the plant. They are powder blue to violet and fluffy in appearance, similar to Ageratums used as garden bedding plants. The tiny seeds are black, elongated, and have long white hairs attached to one end

Required Growing Conditions

Mistflower is adapted to most soil types, but is especially suited to heavy textured and to highly organic soils. Natural stands are found on moist to wet sites, such as low woods, wet meadows, and ditches. It grows best in full sun, but will tolerate light shade.

Blue mistflower is distributed throughout the eastern and midwest United States.

Cultivation and Care

A clean, firm seedbed is essential. The site should be treated with a herbicide to control existing vegetation, tilled, cultipacked once or twice, and allowed to settle thoroughly before sowing. Broadcast ½ to ¾ gram seed per 100 square feet (½ to ¾ lb/acre). Bulk sowing rates usually need to be increased to allow for low purity values. The seed can be mixed with sand or rice hulls to increase volume so that it will be easier to spread uniformly over the planting site. Seed must remain on the soil surface because they are easily smothered when buried in the soil. The seed will not germinate until the following spring, but will benefit from the cool, moist winter environment.

General Upkeep and Control

Apply fertilizer according to soil test recommendations. If not available, a rate of 3½ to 5½ oz/100 square feet (100 to 150 lbs/acre) of 13-13-13 should be applied after the seedlings are established and annually thereafter. Stands can be mowed in the spring and early summer. Later mowings should be delayed until the plants have set seed.

Control Please contact your local agricultural extension specialist or county weed specialist to learn what works best in your area and how to use it safely. Always read label and safety instructions for each control method. Trade names and control measures appear in this document only to provide specific information. USDA, NRCS does not guarantee or warranty the products and control methods named, and other products may be equally effective.

Plant Basics
Growth Rate Moderate
General Type Forb/herb
Growth Period Summer
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Native to U.S.
Commercial Availability Routinely Available
Physical Characteristics
Bloom Period Summer
Displays Fall Colors Yes
Shape/Growth Form Single Crown
Drought Tolerance Medium
Shade Tolerance Tolerant
Height When Mature 3.2
Vegetative Spread None
Flower Color Blue
Flower Conspicuousness No
Fruit/Seed Abundance Medium
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Seed, Sprigs
Moisture Requirements Medium
Cold Stratification Required No
Minimum Temperature -13
Soil Depth for Roots 14
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Regrowth Rate Slow
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 5.5–7.5 pH
Precipitation Range 24–24 inches/yr
Planting Density 0–0 indiv./acre
Soil Textures Fine, Medium
Soil Depth for Roots 14
Minimum Frost-Free Days 170 day(s)
Salinity Tolerance None
CaCO3 Tolerance Medium
Sustainability & Use
Leaf Retention No
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database,
National Plant Data Center, Baton Rouge, LA 70874-4490 USA