Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Sun to Partial Shade
Bloom Color: Blue-Violet
Bloom Time: Late Summer/Early Fall
Other details: Average Water Needs; Water regularly; do not overwater May be a noxious weed or invasive
Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From herbaceous stem cuttings From softwood cuttings From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; stratify if sowing indoors From seed; sow indoors before last frost From seed; direct sow after last frost By simple layering By serpentine layering By stooling or mound layering
On Oct 12, 2008, Meredith79 from Southeastern, NH (Zone 5b) wrote:
I grew this plant from seed in spring and they are blooming wonderfully right now. I used cold treatment and they germinated well. The resulting plants are in a spot that had full sun with a little shade later in the day - while the sun was high in the sky during early summer. Now that it is fall and the sun is lower they get part shade from nearby trees. I hope these are hardy here and reseed because in my opinion, you need a lot to have a nice show of blooms. If they aren't hardy for me I would grow them again as an annual. I've seen them being described as a moist site plant, but they've performed good enough for me with dryish sandy soil.
They need to be placed towards the front of a border, hopefully with a slightly lower growing and long blooming plant in front of them. Mine are in front of and kind of mixed in with Iris and they look nice together. I like the airy effect they have in the garden.
I doubt they would be invasive in a colder zone like 5 or 6. Plus where they are a native, they technically couldn't be. The only place that considers them to be a noxious weed is Kentucky. Although one man's weed.... is another man's treasure : )
On Sep 25, 2008, arthurb3 from Raleigh, NC (Zone 7b) wrote:
Blue mistflower ("Conoclinium coelestinum), the are great fillers that require no care but you want to place it in a confined area to keep it under control. It add valuable color to the Fall garden! http://www.arthurinthegarden.com
On Jul 26, 2008, quiltjean from North Chelmsford, MA (Zone 6b) wrote:
I got a bit of this from a friend because I love the color in late summer. I put it in a dappled-shade location and it has taken off. To prevent its smothering my precious primula I'm taking out a hunk to plant on our condo grounds. We have terrible soil--silty acid junk with awful drainage--so we try spreaders in shady areas where grass just won't grow.
On Aug 9, 2007, upsydaisy from Rochester, IN wrote:
I got a start of the hardy ageratum several years ago. It does well for me here in north-central Indiana, but I haven't had a problem with it being invasive, possibly because we are in zone 5. I really love it, and so do the butterflies!
On Mar 31, 2006, sterhill from Atlanta, GA (Zone 7b) wrote:
A friend of mine gave me this last summer and it bloomed big and beautiful. Now I am picking out millions of seedlings... and I find I can't just pluck out a little seedling but I have to dig down at least 4-6 inches as the roots go 'way down and I find a mass of white roots ready to spring up more seedlings. She has more shade and I don't think hers spreads like this. Mine are in full sun and are everywhere now!!!
On Oct 5, 2005, jnn from Chapel Hill, NC (Zone 7b) wrote:
This is a beautiful fall-blooming plant that attracts butterflies and hummingbirds. It does have a tendancy to spread, but you can keep it in check. It is also easy to dig some up to give to friends or put in other parts of your garden.
On Dec 19, 2004, rcn48 from Lexington, VA (Zone 6a) wrote:
Lovely addition to the garden for its late summer/fall flowering. Although it can be invasive in some areas, we have ours planted in a border in non-amended soil and in 4 years it has not invaded its companions. Nice cut flower for fall arrangements.
On Aug 31, 2002, Terry from Murfreesboro, TN (Zone 7a) wrote:
I tend to like this plant because it is very carefree - it grows wild in a nearby cow pasture. However, it can be a thug, so watch that you don't plant it near something that has a delicate constitution. And don't feed or water it too much - thin, dry soil will help keep the growth in check.
On Aug 31, 2002, lupinelover from Grove City, OH (Zone 6a) wrote:
This plant is highly invasive in loose to medium soil. The beautiful flowers in late summer and autumn help to compensate for trait, though. Grows and flowers well in full sun to medium shade, wet to dry. A wonderful addition to a meadow or natural wildflower planting area large enough to accommodate a beautiful wildlife attractor.
This plant has been said to grow in the following regions:
, Auburn, Alabama Morrilton, Arkansas Laguna West-lakeside, California Boyette, Florida Jacksonville, Florida Melrose Park, Florida Merritt Island, Florida Oldsmar, Florida Calhoun, Georgia North Decatur, Georgia Crescent City, Illinois Itasca, Illinois Mount Prospect, Illinois Galena, Indiana Rochester, Indiana Wichita, Kansas Lakeview Heights, Kentucky Taylorsville, Kentucky Weeksbury, Kentucky Abita Springs, Louisiana New Orleans, Louisiana Crofton, Maryland Valley Lee, Maryland Westminster, Maryland Cambridge, Massachusetts North Chelmsford, Massachusetts Okemos, Michigan Waynesboro, Mississippi Grandview, Missouri Hudson, New Hampshire Frenchtown, New Jersey Ramblewood, New Jersey Chapel Hill, North Carolina Elizabeth City, North Carolina Franklin, North Carolina Greensboro, North Carolina Raleigh, North Carolina Winston-salem, North Carolina Deer Park, Ohio Glouster, Ohio Grove City, Ohio Highland Heights, Ohio Reynoldsburg, Ohio Freemansburg, Pennsylvania Whitehall, Pennsylvania Barrington, Rhode Island Conway, South Carolina Florence, South Carolina Oakland, South Carolina Saint Matthews, South Carolina Clarksville, Tennessee Forest Hills, Tennessee Austin, Texas (2 reports) Carrollton, Texas Cleburne, Texas Crowley, Texas Dalworthington Gardens, Texas Irving, Texas Lasana, Texas Longview, Texas Meridian, Texas Princeton, Texas Rye, Texas Arlington, Virginia Franconia, Virginia Hood, Virginia Leesburg, Virginia Lexington, Virginia Kalama, Washington Bayside, Wisconsin