One successful use of manual control has been the treatment of spotted and diffuse knapweed and mullein.
The broad leaves at the base of common mullein are easy to spot.
British Dictionary definitions for mullein
any of various European herbaceous plants of the scrophulariaceous genus Verbascum, such as V. thapsus (common mullein or Aaron's rod), typically having tall spikes of yellow flowers and broad hairy leaves See also Aaron's rod
C15: from Old French moleine, probably from Old French mol soft, from Latin mollis