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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)
Sun Exposure: Sun to Partial Shade
Danger: Handling plant may cause skin irritation or allergic reaction
Other details: May be a noxious weed or invasive This plant is attractive to bees, butterflies and/or birds Self-sows freely; deadhead if you do not want volunteer seedlings next season This plant is resistant to deer
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: From seed; direct sow outdoors in fall From seed; stratify if sowing indoors
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds
On Aug 29, 2009, mslehv from Columbus, OH (Zone 5b) wrote:
This is truly a massive plant with almost flourescent purple blooms. Unfortunately, the bloom period is limited to about three weeks. The "Ironweed" may refer to its roots - even a six inch first year plant had deep, thick, iron-like roots. In full sun, first year growth was over six feet and second year reached over nine feet (see posted image).
On Jul 7, 2007, jostoich from Sacramento, CA (Zone 9a) wrote:
I love it. I've had it for several years in my backyard in Sacramento, CA. It hasn't become invasive for me and hasn't reseeded or spread at all. I have it planted in partial shade near a wooden post that a bird feeder hangs from. The color is vivid and bright...new birds have been visiting my yard this year. Perhaps this plant is attracting them, but I do have many other plants that also attract birds.
On Sep 9, 2005, Breezymeadow from Culpeper, VA (Zone 7a) wrote:
This lovely wildflower is just coming into its own this time of year (September). Indigenous here - the Piedmont area of VA - it enjoys both the sun & semi-shade of damp to marshy meadow areas. It's extreme height along with the deep royal purple blossoms can be seen from quite a distance.
While it may be considered a noxious weed in some areas, that doesn't seem to be the case around here, where it is rarely found in any sort of massive abundance
On Apr 5, 2004, JenniesWorld from Spencer, WV wrote:
This woody weed can get quite tall, often towering over the cattle in the pastures where it thrives. It seems to like moist areas, and even does well in semi-shade. The color intensity of the blooms are awesome, with rich shades of purples. Too bad it is a noxious weed! Some places you can be fined for letting it grow! Jennie
Regional...
This plant has been said to grow in the following regions:
Auburn, Alabama Morrilton, Arkansas Sacramento, California Fort Lauderdale, Florida Pensacola, Florida Melbourne, Kentucky Salvisa, Kentucky Florence, Mississippi Lake Toxaway, North Carolina Columbus, Ohio Fort Jennings, Ohio Carlisle, Pennsylvania Millersburg, Pennsylvania Pennsburg, Pennsylvania Maryville, Tennessee Arlington, Texas Princeton, Texas Santa Fe, Texas Kalama, Washington Spencer, West Virginia