Spent 1.5 hrs today in my "organic" front yard dealing with black medic. The ground is moist from all the rain, so I was able to get the entire root on about 60% of them. In all I pulled a 2 1/2 gallon bucket full (out of about 2,500 sq/ft). Other than 1 broadleaf Plantain and about a dozen small Oxalis shoots, this is the only weed that is in my yard. I aerate. Overseeded with 15lbs of 60% Perrenial Rye, 40% bluegrass. Sunshine, water. Organic Fertilizer (early April & June) 50lbs. Any ideas on why I'm getting so much of this weed? Tip for those pulling like I am. Rake it up first from all directions with a garden rake. Once you have all of the arms of it up and out of your turf grass, it's pretty easy to pull.