We have a large patch of burdock that was growing under an evergreen tree when we moved here. The tree has been cut down and I have been trying to get rid of this 'weed' for over a year. I cut the flower heads off the minute I see them to prevent more plants but there are burdock plants in the lawn (more obvious during this long drought period in up state NY) and through out the property. I do not like to use chemicals and have been using a mixture of table salt, white vinegar and dish soap which works but so time consuming and hard on my back ... bending over so much (I'm in my 80's). Any suggestions would be helpful. Thank you.

Do a search for burdock on a site called "field crop news.com". It outlines the life cycle of burdock and shows the best timing for eradication, which is before the plants bloom. I hope you are tightly bagging the seed heads when you remove them, which prevents the seed from spreading. Your salt-vinegar-soap combo should work well.