Yes- ammonia does kill weeds. The problem- however- is that ammonia is a non-selective weed-killer and will kill all plants it comes into contact with. ... Once inside a plant, ammonia lodges onto its cells and starts dehydrating them, consequently leading to the death of all top growth.

What kills weeds permanently?

Permanent Weed and Grass Killer Spray

A non-selective weed killer, such as Roundup, is a great option for killing weeds and grass permanently. The Glyphosate in Roundup works by infiltrating the plant through the leaves. From there, it attacks all plant systems and kills them completely, including the roots.

Will ammonia kill grass permanently?

Unlike other weed killers, Ammonia is a non-selective weed killer. This means that it will not only kill weeds but everything it touches. ... The ground will take in the Ammonia directly into the roots of the plant. If the roots are dead, the regrowth will not occur; hence the weeds are permanently eliminated.