what herbicide is best for creating a permanant nothing grows there zone?

Rm, oust, and diesel

keakar, how much is your house raised that you have sufficient light that weeds grow underneath it? What kind of weeds.

Salt is a pretty good retardant to suppress plant growth - I’m kind of kidding and kind of not. You could sterilize the soil for weed growth with enough salt. Wouldn’t do it with metal piping under the house.

There are some pretty strong commercial use herbicides that might do a job. Need someone like Gamecocks22 to read this and share his knowledge.

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keakar, how much is your house raised that you have sufficient light that weeds grow underneath it? What kind of weeds.

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its bad, its 4ft if not a few inches higher and its growing weeds like crazy like you find in the brushy areas in the woods. its those vine like weeds where you pull and it comes out as 5-6 ft lengths of vines

i use a stiff rake to pull most of it out and then treat it but i cant really find anything thats more then a temporary growth stunt for it and by week 3 its back in full bloom again

it fricking grows faster under the house then the grass in my yard does because its always damp under there being slightly lower then the rest of the yard

Bushy vines like in the woods - you can try repeated applications of trichlopyr - it’s a herbicide formulated for that purpose. Often sold as bush and vine killer.

Sold under different brand names, but for your needs you want one with a high % of trichlopyr as the active ingredient, like 50+% The home use versions have like 8.8% but even it works good. Should be carried by a good hardware stores with an ag orientation, or Ag feed stores, maybe even Tractor Supply.

It’s likely going to take some repeated applications, to translocate to the roots to kill the vines permanently. So you will kill it above ground initially, it will come back from the roots, and spray it again. Eventually you’ll kill the entire root system. I’d be surprised if that doesn’t work for you.

You might want add surfactant to the solution to increase absorption - I don’t know if concentrated forms have surfactant incorporated or not.

Does the vine happen to look like this? Virginia creeper. Or look like something else.

You aren't going to stop vegetation from growing there if it's getting the elements required for life. If you stop sunlight, water, air, or nutrients from getting under your house, you will stop vegetation. Obviously, sunlight is probably the only realistic one to stop. Would be very helpful to know what the setup is under your house.

have you tried weed barrier or other means to physically block growth as opposed to chemicals? I have a conventional foundation and have never had any growth under my house.

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, i also tried straight gas which works the best but the wees are back again in a week or two, i tried straight diesel and even 50/50 diesel mixed with used motor oil and it just leaves oily film on ground while the weeds still grow back

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I have used Eliminator Weed & Grass Killer Super Concentrate, 32 fl oz from walmart for over 15 years around my yard. Never had to reapply in less than 6 weeks. Get the super concentrate; stronger than regular concentrated formula.

you can also increase soil acidity to prevent weed growth by using pine straw, etc.

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You aren't going to stop vegetation from growing there if it's getting the elements required for life. If you stop sunlight, water, air, or nutrients from getting under your house, you will stop vegetation. Obviously, sunlight is probably the only realistic one to stop. Would be very helpful to know what the setup is under your house.

have you tried weed barrier or other means to physically block growth as opposed to chemicals? I have a conventional foundation and have never had any growth under my house.

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its high and well ventilated but it gets lots of sun while the ground stays damp for days after a rain

if i block the sunlight im afraid i'll create a termite heaven by giving them cover since sunlight is the biggest deterrent that keeps them away

ice cream salt

did you not pay attention in ancient history class?

the romans defeated the Carthaginians and salted the earth of Carthage so that nothing would grow. I guarantee you if you smother the area under your house with rock salt nothing will grow there

Sahara, Hyvar-X, or Diuron.

This will all kill trees if you spray under their drip line.

Diuron is a 12 month pre-emergent used in conjunction with other burn downs in industrial sites, like power substations.

The weed you have appears to be cats claw. A heavy dose of triclopyr will remedy that problem. Imazapyr will also work.

Anything that spreads vegetatively can grow back under your house. So you will probably end up spraying every 4-6 months if you want it bare.