Question
I'd like to kill the grass under my horse fence. Trimming is a real chore since I have almost a 1/2 mile of fence. I'd like to use something organic since the horses eat the grass and I don't want them to get sick. Cost is also a concern with that much fence. Any help is greatly appreciated!!

Answer
Hi Paul;
On a nice HOT day, while the sun is up and can really make it work, pour vinegar on the grass for a trail along the fence about 4 or 5 inches wide to make a dead zone far enough on each side of the fence to make it easy to mow, and not have to edge.
Pickling vinegar is best as it has a higher acid content, and will take less to kill the grass.
Pickling vinegar has a 10% acidity , and white vinegar has only 4 to 5 percent, depending on which brand you buy.
With the lower acidity vinegar, you have to saturate a little more.
After it is killed off ( should only take a day or two for it to die out, then, if you pour a thinly mixed concrete along the fence, it will keep the grass from ever growing back, and will make an edge for the mower to run along.
A mile of fence is a lot to treat, but if you take it in stages, in a short time, you could have it all covered.
Or, you can saturate the ground with oil, after you kill out the grass.
Oil will soak into the ground, and nothing will grow where it soaaks in.
To make sure it is safe for the horses, should they ingest some of it. You could use cooking oi.
but the concrete will last longer, and will dry hard.
If you make it thin enough to soak into the ground, it will work very well.
You could also till up the soil a little, pour dry concrete in it, mix it a little, and that would make a permanent barrier.
Charlotte