A stubborn weed

this weed is very thorny it really hurts to try and pull it out unless I have very thick gloves on it has large leaves and blooms in blue bell like flowers and now a white one I have been killing them with vinegar as soon as I see one but they are coming up in the middle of my perrenials and I don't want to harm my plants anyone know what this is and how do I rid the garden of this weed Also I cannot upload photos to this site and I don't know why it will not upload on my laptop ....help please :)
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