General Question

2davidc8's avatar

Can you use trisodium phosphate (TSP) to kill weeds?

Asked by 2davidc8 (9701points) August 28th, 2016

Somehow I wound up with a bag of trisodium phosphate, and I’m wondering how I might put it to use. Can I spread it like salt on weeds, or will it in fact make them grow even faster because the phosphorus is one of the basic plant nutrients (NPK, or nitrogen-phosphorus-potassium)?

If not to kill weeds, what’s a good use for TSP?

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10 Answers

Coloma's avatar

TSP is used as a cleaning agent.
I wouldn’t use it to kill weeds. Here’s an article from a reliable source, and the thing is, even if it does kill the weeds it could, potentially, cause harm to small animals, birds and, of course, do you really want this stuff in your soil and groundwater? Just pull the weeds and research other ways to use this compound or, better yet, take it somewhere to be safely disposed of.

Here’s another.,V8OAtXY_BU

ibstubro's avatar

TSPs are used as cleaning agent, lubricant, food additive, stain remover and degreaser.

Googiki is your friend.
There’s a bit on there about it being an excellent mildew remover – if you’re near an area hit by sudden flooding Who isn’t? you might want to donate it, or make up the solution and donate that.

Coloma's avatar

@ibstubro It never floods in my area.

ibstubro's avatar

Never say never, @Coloma.
The results could be catastrophic.

Coloma's avatar

@ibstubro I live in the mountains, the only thing that could flood would be the river which is miles from me. Hard to flood when your at an elevation.

2davidc8's avatar

TSP is a stain remover? Wow, maybe I’ll try it that way.

Coloma's avatar

@2davidc8 It might work say on oil stained concrete, or a garage floor, etc. It is often used to clean walls before painting to remove dirt and grease and grime.

Cruiser's avatar

Use vinegar and salt solution. I think it works better than Roundup. Be careful with the overspray as it will snuff out anything that grows.

2davidc8's avatar

@Cruiser Thanks for the link to Everyday Cheapskate!
I see that TSP also works as a degreaser. I’m going to try it next time I need to unclog my drains!
As for weeds, I like the vinegar + salt idea of @Cruiser.‘s
Thanks, jellies!

monthly's avatar

I used to use it as a cleaning agent in home brewing beer.

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