If you're cutting/pulling it before it sets seed, you don't have to worry about composting it hot, because you won't have seeds to kill. About the only way you're going to get rid of the infestation is a 5 year program of killing/removing it before it flowers. Use herbicide in early spring, or cut it to the ground before it flowers. If you live in a place which allows it, fire also works. The key is to keep at it until the rootstock dies and the seedbank is exhausted.

I bagged a bunch of it and let it turn into an anaerobic slime in the garbage bag, then I mixed the stinky slime into the compost pile. I wouldn't really reccomend that because I am sure there are better ways to handle it...

Thanks everyone. I have read all the standard literature on GM. Some of it suggests that even pulled or cut plants can still ripen seed (that's just not fair if it's true). It's also a bit alleopathic so I have been wary of putting it anywhere near tender plants. I cut it, pull it and poison it but it's still far from gone although improvement has been accomplished. The real trick, as with so much of what I do, is dealing with the debris. Since I am dealing with so much volume maybe I could use some tarps to do a larger version of Joe Pye's garbage bag method??

I compost all of my weeds but I do cut the flowers/seedheads off first and throw them in the garbage can. This could be way too time consuming for you but you might find a system that works. I am doing this with canadian thistle and I don't think I am speading it. Good Luck and don't give up!

We had a long bitter cold snap this year and a better than average snow cover, so I am hoping that this real winter weather will put a dent in GM growth this spring.

My non-scientific assumption was that the GM proliferation in my area the last couple years was due to the mild winters that we had...

Don't get your hopes up, JPW. I fought a 2-acre infestation of it in the snow-belt of NE Ohio, where we averaged a few hundred inches of snow every year. The Mustard flourished.

Drat! That is not what I wanted to hear.

There is some attrition of GM over the winter but there is usually still a lot that survives.