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programs
Invasive Plant Guide: Spotted Knapweed
Centaurea maculosa
Both Spotted knapweed & Meadow
knapweed infestations occur in the
Mid Klamath area.
Spotted Knapweed Flower
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Identifying characteristics
- Flower color: pinkish purple with fuzzy white center
- Flowers: July to September
- Plant height: 8 inches to 6 feet
- Stems: One or more, branching
- Basal leaves: feathery, lobed
- Bracts: tipped with dark tinged
- Growth habit: biennial or short-lived perennial with stout
taproot
- Similar to Meadow knapweed
Occurrence
From 400-4000' elevation, adaptable to a variety of habitats.
Moist areas, dry roadsides, in the shade or sun.Spotted
knapweed has small, isolated occurrences along the Klamath River and
upslope sites. Most of these are in and around Orleans.
Spotted Knapweed Plant
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Notes
Spotted and Diffuse Knapweed were first discovered by the USFS on
the Salmon River in 1997, with concentrated populations in the Kelly
Bar vicinity on the North Fork Salmon River. Both species are rated
"Class A" species, which mandates eradication as described in county
and state health codes. Local land managers promoted the status quo
management approach, which was to apply several different herbicides
for at least five years. In response, the local community launched
one of the most effective noxious weed efforts known in the region,
significantly reducing or eliminating knapweed plant concentrations
in over 250 sites. This program was taken up by MKWC volunteers on
the Klamath River in 2001. More Info
- California Department of Food & Agriculture
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www.cdfa.ca.gov/phpps/ipc/weedinfo/centaurea.htm
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