Is The Teasel Weed harmful to human being's and if so
what are the effect's to human's?
I don't think that it is harmful, except for having short spines.
The following might be helpful:
Anthony Brach, Ph.D
I do not believe there is any harmful effect of teasel on humans; however,
teasel is a serious invader of native communities and often grows in dense
colonies that reduce biodiversity.
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Update: June 2012