 What we want is enough sample to properly diagnose your problem. So, you know, kind of get into that a little bit. We want 12 inches by 12 inches, three to four inches deep. You know, more is typically better, but you don't need to go wider than 12 inches. And the biggest thing that we ask for is that we want your sample to include the problem area and where that problem area transitions into the healthy or the living part of the yard. Because if you have a problem, that's typically where it's going to be is in that transition.