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Woolly distaff thistle is an erect winter annual with rigid stems. It flowers from July through August. It grows up to 3½ feet tall, has spiny pointed leaves that are alternate. The flower head has many long, sharp leaf-like bracts just below the yellow flowers. The rigid stems with old flower heads and leaves often persist through winter and often longer.
|Soil and Moisture Conditions
|Found sporadically along the west coast.
|Mow to prevent seed heads. Dig out roots or apply herbicides for a more sucessful removal, but must be maintained.
|Remove seed heads and bag. Bag and throw away plants when dug out.
|Reproduction and Spread
|Spread through Waterways and hay crops.
|Discovered in Oregon in1987
|Smooth distaff thisthle
|Unable to be grazed, this species overtakes grasses and outcompetes more palitable species.