trolleystation

Boiling water does a great job on any pesky weeds.

Garden Gnome

I hadn't heard of Tordan so I looked it up. It is recommended to kill some pretty tough old brush and trees, so I bet it will work on your greenbriar. It won't kill the grass, but it will kill other broadleaf plants that it gets on, such as perennial flowers, peonies, lilies, etc. It is systemic; goes into the roots, so can kill the underground parts of the plant.

I was going to suggest using Triclopyr, which is another systemic brush killer. Maybe this Tordan is newer.
Don't give up. It takes a while to work, but you will have better results than just something that top-kills, like round-up.

sailsablazin

Online you will find the recipe as Weed Be Gone
1 Gallon Vinegar
2 cups Epsom Salt
1/4 cup Dawn (Original blue) dishwashing soap

It will kill anything that you spray it on. Just mix and spray in the morning, after the dew has evaporated.
Go back after dinner and the weeds are all gone.

tranum

im told this is effective but it must be more than 5% household vinegar.

crafty pat

I find stronger vinegar at nursery's. I have had wonderful results with it for every thing above ground. When I have killed all above ground I pour boiling water over the root area and it takes care of the rest. It will kill anything else around that area also so you have to be very careful with other plants and grass.

wildyard

I have been fighting Japanese bittersweet in my front yard. I think the birds planted it, but it's some nasty stuff. It is trying to take over everything out there. I will be trying some of your suggestions for sure!

Suz

I used boiling water on 4 o'clocks after many many other mixtures and digging.

annievee

You can find cleaning vinegar at Dollar Tree stores for $1.

mstalnaker

my husband uses this formula too

mstalnaker

We use the Vinegar, Epson Salt, and Dawn too. works great for most weeds.