I feel obligated to say that one should respect the power of tumbleweeds, aka Russian Thistle. The wife said she did her best to shake out all the seeds over time, and disposed of them in the trash, before we actually let it run loose in the yard. As much as I would love to see tumbleweeds every day, without natural predators in a nonnative area I have to wonder if a few stray seeds could cause a problem. A plague of tumbleweeds upon the land. So, shake out those tumbleweeds. Like all pets you don't intend to breed, they should be fixed.