Key identifying traits
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Entire plant covered with
sticky glandular hairs
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Small yellow flowers
growing in clusters
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Has a tar like odor that
gets stronger as plants mature and start to dry
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Grows 1 to 2 tall
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Tar is difficult to
clean from pets and grazing animals
Biology and ecology
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An annual spreading by
seed
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It is classed as a
poisonous plant but animals normally avoid it
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This plant is a native to
North America and British Columbia inhabiting forest openings to
grasslands. Establishes on disturbed areas and over grazed pastures
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A.K.A. stinking tarweed or
mountain tarweed
Control
Prevention
Learn to identify plants; start monitoring early in the season
Biological
No known biological control in our area
Cultural
Plant competitive grass or other cover crop
Mechanical
The plants can be effectively pulled. Mowing or weed whacking
before they flower can also reduce populations
Chemical Tordon 22k, Transline, or
Banvel are listed to be excellent for control, but must be done when
plants are young and actively growing. Check
PNW Weed Management handbook for more information.
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