You guys answered my questions without my even having to ask! I was going to ask about Roundup and about fire damage. After watching the above video of them burning they seem like a real problem for fire. After checking about local tumbleweeds it turns out they are an issue here, too. There is a farm locally that is for educational purposes. They do things much as they would have done in the 19th century with some modernization. They currently have an issue with tumbleweeds it turns out. They're doing everything they can to deal with it. They do controlled burns of the property, including the farming fields, in some yearly rotation (don't know how often). They're doing about double the burns to try to control the tumbleweeds right now. They're trying to burn the tumbleweeds in place so they don't have the chance to spread their seeds, and then (after marking where they were with steel posts) they dig up that area and dump the soil in the swamp. Apparently submerging the seeds in water kills them.
Who knew. I actually learned things at FOH today!
Who knew. I actually learned things at FOH today!