Have you investigated the many factors involved in what is called Centipedegrass Decline? It would be worth your time to investigate. Improper fertilization, watering problems, soil pH, herbicides, and other abiotic factors can all contribute to Centipedegrass Decline. The first thing that comes to my mind, however, when reading your post is nematodes. When I lived in Beaufort County, the issues with several species of nematodes were becoming very serious. We tried to convince people to stay away from Centipedegrass because of it. Homeowners don't have the arsenal of nematicides available to them that golfcourses do. If you haven't already done so, check with your local Clemson Extension office for advice about how and when to collect soil for proper nematode assay. I know that I haven't addressed your herbicide question, but unless the cause of the problem with your grass is resolved, you'll always have a terrible stand of grass. Clemson can also be very helpful with recommednations for weed control, too. Ask to speak to an agent who specializes in turf, rather than a master gardener volunteer.

My wife juiced a lot of plants,but not that one. I had the thistle growing in a sandy spot & emailed to see if she had a use for it. This person ran a nursery & got plants from me to flush out her stock & growing beds. I do not know of any thing the plant is good for. It is not listed in my Venomous animals & Poisonous Plant Field Guide. If I knew of a good usage, I would have added it in the first post.You could try the herb forum. If you hear of a good usage, we could use one here in S.C.

Weed B Gon is labeled for the control of sow thistle. However, I would suspect that an application during the winter would have little effect on this weed. I would think that for best results, treatment should be applied when the weeds are young and actively growing, which would be during late Spring or early Summer.

Dad says it looks like Lactuca scariola. Then he told me some intresting things: it is called prickly lettuce and can be steamed eaten or eaten raw when the plants are small. You can eat it when the plants get bigger but it is bitter and gives the gas. It's the milk that is interesting. It has a lot of medicine uses like pain reliever and sleeping but is kind of powerful so it can make you sick or worse if you take too much internally.