How do I get rid of my sage brush/tumble weed plants?

It has a really deep tap root and I can only pull up a couple before I'm exhaust. They're in the rock section of my yard and are getting huge. What can I do? Their stems too thick for the usual weed whacker.

Answers:
Roundup. You can get it at Lowe's in a spray bottle. But be careful when you spray, because Roundup will kill everything. Don't do it on a windy day.

Other answers:
Roundup
Roundup
  • Where can I buy a Venus Fly Trap in Australia?
  • How do you keep squirrels out of your flower beds?
  • what is a tent worm?
  • When should I start my garden in Portland, OR?
  • The leaves on my blueberry bushes are turning light green. What is wrong?
  • what can i spray on ground fetch in my flower beds to kill it without hurting my flowers?
  • what would be a good vegatable to plant in July?
  • why don't my columbine flowers have colour? I bought them diff. colours but this year's blooms are all white
  • How much should I charge for mowing a sward within Indianapolis?