I've been using the weeds to prepare planting beds. We have an abundance of "noious weeds" here. Kochia and various forms of knapweed. Goats go crazy for knapweed, but usually only as it's beginning to flower. They like kochia when it's young. It makes great deep litter for chickens when mature; it's got lots of high protein seeds that they love. In the spring, it goes in the compost.
When researching plants, use the botanical name. I found out more than "it's a noxious weed, get rid of it". These plants are used as forage during drought. They are deep rooted plants that are drought tolerant.