what is your most noxious plant/weed?

Not my beds or yard but at my land/farm, I have to work at killing Johnson grass, sweetgum trees and blackberry

In the yard, not sure. I do have chamberbitter in the cracks of my patio throughout the summer. Have a few spots that have nutsedge but not too bad.

Virginia Buttonweed
POA
Goosegrass
Chamberbitter
Burrweed

ETA: nutsedge this year. is it too hot for sedgehammer/dismiss?

My losing battle with bamboo is well-documented here

Lawn: Yellow Nutsedge
Beds: Yellow Nutsedge

Sedgehammer

Torpedo Grass

How much time you got?

Lespedeza
VBW
Nutsedge

In that order. It's mostly for the lawn....rarely have weeds in the flower beds.

Lawn-- Basketgrass in the back yard.

No selective herbicides will do anything to it. Spend way too much time pulling it; always seems to come back, but its numbers are dwindling probably due to my constant weeding and gradually being crowded out by the zoysia and St. Augustine

Bedding areas, particularly in back yard-- Bushkiller vine:



This stuff is insidious. Never stops. Runs underground and pops up everywhere. I swear it will grow a foot a day. Doesn't help that the guy behind me has a backyard infested with it. Biggest problem is that if you weed it, it just breaks off underground at the runners, and will just re-sprout:


Best you can do is try to get down and pull out as many runners as you can, but they will run under and through root systems of your shrubs and bedding plants, so it is a mess. Other option which works well is to pull a section of vine off the plants, bunch it up, lay it on bare mulch (or on a sheet of plastic if it is on grass or plants you need to save) and douse the heck out of it with Round-Up or other herbicide and let it take for a day or so, which allows the product to get absorbed down into the runners.

Now that's a working man's finger.

Yucca (shiate is armor-plated) and bamboo. You can't kill with fire alone.