Hardiness: USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) 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 Light Shade
Danger: All parts of plant are poisonous if ingested
Bloom Color: Medium Blue Blue-Violet
Bloom Time: Mid Summer Late Summer/Early Fall
Foliage: Herbaceous Smooth-Textured
Other details: Requires consistently moist soil; do not let dry out between waterings Very high moisture needs; suitable for bogs and water gardens
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From seed; stratify if sowing indoors From seed; sow indoors before last frost
Seed Collecting: Allow pods to dry on plant; break open to collect seeds Properly cleaned, seed can be successfully stored
My favorite flower! Beautiful and very long blooming, with long flowering stalks. We have those in our front yard in front of yews and boxwoods and get a lot of compliments for those. Easy to grow and low maintenance, with mid summer to fall blooming period. Heavy clay soil and get not much water there, and it's north side with part shade, but doesn't stop it from thriving. We also have on the side of the house where it gets morning sun, and it is the most outstanding flowering plant we have. I love those deep blue flowers!
On May 31, 2010, EllaTiarella from Portage, MI (Zone 5b) wrote:
It's invasive in my garden; however, I do appreciate the late-season color. I bought one plant two years ago, it got ahead of me, and now it's "everywhere"! I think I have over 50 plants here and there in the 20 feet or so around the original. I plan to dig quite a bit of it out, and leave just a clump or two. My recommendation is to be on guard for seedlings, and be sure to dig them out right away where they are not wanted. Perhaps prompt deadheading would help.
On Dec 3, 2009, jmorth from Divernon, IL (Zone 5b) wrote:
Blooms late summer to fall here. It's a wildflower in Illinois, often found in wet ground, marshes, and fens. Mine grow quite peacefully in the garden with no special H²Oing consideration. These plants self-seed but mine haven't portrayed any invasive characteristics. Butterflies and hummers are attracted to their flowers and being a relatively late bloomer they can be a major attractant.
Reportedly native Indians (Mesquakies) finely chopped the roots and secretly mixed them into the food of a quarrelsome couple to rekindle love lost. Other tribes used it as a cure for syphilis (probably influencing the siphilitica part of the scientific name) and other ailments.
These plants self-seed but mine haven't portrayed any invasive characteristics. Butterflies and hummers are attracted to their flowers and being a relatively late bloomer they can be a major attractant.
On Sep 2, 2008, plantaholic186 from Winnetka, IL wrote:
I love this plant, but I warn others that given a wet location, it's an aggressive spreader. I planted one in a very wet area of my garden, and there are seedlings everywhere. They're all blooming, so at least there's that, and they are easy to pull out, so I thin them out periodically. I have some in a full sun, hot, dryish bed that does beautifully, but hasn't spread babies around. I absolutely love this plant though: a beautiful blue.
On Aug 16, 2007, dkm65 from Cedar Falls, IA (Zone 4b) wrote:
Intense blue flowers, on the violet side of the color. It mixes well with its sibling, cardinal flower (Lobelia cardinalis), with it similar bloom times and very intense, deep red flower. It doesn't draw hummingbirds like cardinal flower, but they do feed on it.
The plant file notes that it has above average water needs, but this isn't entirely accurate. As with many prairie natives, it can tolerate periods of drought, as it has very deep roots. It does best when it is in a low-lying spot, such as a swale or raingarden, with well-drained but occasionally flooded soil. Ours does fine going several weeks without any rain or watering once established.
On Jan 17, 2005, JodyC from Palmyra, IL (Zone 5b) wrote:
The flowers attract bumblebees primarily. Less common visitors include hummingbirds, butterflies, and Halictid bees. The latter group of bees collect pollen only and are non-pollinating. Most mammalian herbivores don't eat this plant because the foliage contains several toxic alkaloids, chief among them being lobeline and lobelanine. These toxic substances produce symptoms that resemble nicotine poisoning. However, it has been reported that deer occasionally eat this plant, perhaps enjoying greater immunity to these toxic substances than other animals. The seeds are too small to be of much value to birds.
On Oct 4, 2004, hanna1 from Castro Valley, CA (Zone 9a) wrote:
I bought mine in Spring at my favorite nursery in Oakland, I transplanted it in a new pot in semi-shade, got a lot of water, was beautifull, and very blue, I had never seen one before, new plantlets are growing at the base of the original and I can't wait to see it take off again.
On Sep 28, 2003, Karenn from Mount Prospect, IL (Zone 5a) wrote:
I really like this particular variety - it shuffles itself around the planting bed and parks where it is happiest! It is not invasive (like goose-neck loosestrife), just puts a clump or two around the bed. And blooms just when the summer bloomers are fading! What a great plant!
On Aug 7, 2003, Ladyfern from Jeffersonville, IN (Zone 6a) wrote:
Easy from seed--will even bloom a little the first year! Great for the butterflies and hummingbirds. The foliage is a handsome dark green. A group of these is just specatacular in the late summer garden.
On Aug 31, 2002, lupinelover from Grove City, OH (Zone 6a) wrote:
This plant is much easier to please than the better-known Scarlet Lobelia, so that most gardeners should be able to find a place for it in their landscape. It tolerates full shade, but blooms much better in full to partial sun.
On Mar 8, 2001, Terry from Murfreesboro, TN (Zone 7a) wrote:
Native to North America, produces spikes of blue flowers in late summer. The plant grows well in moist to wet soils and so is useful near water. The plant may be short-lived but will tend to reseed.
This plant has been said to grow in the following regions:
, Auburn, Alabama Castro Valley, California Edgewater, Colorado Cornwall Bridge, Connecticut Simsbury Center, Connecticut Pike Creek, Delaware Aurora, Illinois Divernon, Illinois Itasca, Illinois Mount Prospect, Illinois Northfield, Illinois Rockford, Illinois Washington, Illinois Wilmette, Illinois Bloomington, Indiana Logansport, Indiana Macy, Indiana Oak Park, Indiana Cedar Falls, Iowa Derby, Kansas Overland Park, Kansas Hebron, Kentucky Baltimore, Maryland Potomac, Maryland Sharon, Massachusetts Erie, Michigan Lake Orion, Michigan Pinconning, Michigan Royal Oak, Michigan Andover, Minnesota Hopkins, Minnesota St Paul, Minnesota Byhalia, Mississippi Florence, Mississippi Cape Girardeau, Missouri Cole Camp, Missouri Glendale, Missouri Piedmont, Missouri Hudson, New Hampshire Nelson, New Hampshire (2 reports) Browns Mills, New Jersey Frenchtown, New Jersey , New York Averill Park, New York Buffalo, New York Croton-on-hudson, New York Glens Falls, New York Syracuse, New York Yonkers, New York Chapel Hill, North Carolina Elizabeth City, North Carolina Belfield, North Dakota Fremont, Ohio Glouster, Ohio Coopersburg, Pennsylvania Fullerton, Pennsylvania Greensburg, Pennsylvania Laflin, Pennsylvania Lawrenceville, Pennsylvania Philadelphia, Pennsylvania Saylorsburg, Pennsylvania Conway, South Carolina Murfreesboro, Tennessee Old Hickory, Tennessee Austin, Texas Dallas, Texas Longview, Texas Sunset Valley, Texas Arlington, Virginia Leesburg, Virginia Lexington, Virginia Pearisburg, Virginia Roanoke, Virginia Kalama, Washington Pullman, Washington Cambridge, Wisconsin Pleasant Prairie, Wisconsin