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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) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F)
Bloom Time: Late Spring/Early Summer Mid Summer Late Summer/Early Fall
Foliage: Herbaceous Blue-Green
Other details: May be a noxious weed or invasive This plant is attractive to bees, butterflies and/or birds Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From seed; direct sow outdoors in fall
On Nov 3, 2007, distantkin from Saint Cloud, MN (Zone 4b) wrote:
Minnesota DNR invasive list
Ecological Threat:
Orange hawkweed invades northern moist pastures, forest openings, abandoned fields, clearcuts and roadsides. Its greatest density occurs on newly disturbed sites, as it is an early succession plant. Its largest distribution is in northeastern Minnesota.
Loss of native plant diversity in infested areas, orange hawkweed colonizes rapidly forming a solid mat of rosettes. The plant may have allelopathic effects on neighboring plants.
Orange hawkweed is a native of Europe and is listed on the MDA Secondary noxious weeds list in Minnesota.
On Apr 1, 2007, Joan from Belfield, ND (Zone 4a) wrote:
This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ND Weed Control Association and other agencies.
Plant Features
Perennial, 10 to 20 inches tall
Basal leaves hairy, spatula-like, stems leafless
Many orange (dandelion-like) flowers on the ends of each hairy stem, petals have notched tips
Blooms June through July
Entire plant contains a milky juice
Roots shallow, fibrous
Spreads by creeping roots and runners (rhizomes and stolons)
Distribution
Documented in a single area. Very aggressive, grows under most conditions
Interesting Facts
Livestock graze plants
The plant (and pollen) releases a toxin that inhibits other plant growth (allelopathic)
Native hawkweeds do not produce above ground runners or basal rosettes
On Nov 25, 2004, caron from Woodland Park, CO (Zone 4b) wrote:
Colorado Class B Noxious Weed. Mandatory eradication in all counties except Douglas and Jefferson.
All locations of this plant in Colorado should be immediately reported to the Colorado Department of Agriculture.
I feel like shouting at everyone, do not let this plant start in your area or you will never get rid of it. It is taking over rancher's fields, it likes a dry climate. It chokes out everything else and offers no nutritional value to animals.
We had it in our yard and were required to use herbicides or the county commissioner would bill you to do it. They would even supplement the cost if you did it yourself.
My brother works for the forest service and said it is really a serious problem and is getting worse because people think is pretty and take it out of it's natural habitat.
Even a scintilla will allow it start. it is a terrible plant!
Regional...
This plant has been said to grow in the following regions:
Cadillac, Michigan Midland, Michigan Reed City, Michigan Saint Helen, Michigan Isle, Minnesota Kalama, Washington
5 members have or want this plant for trade.
