I've used it and had pretty good luck with it so far as preventing seeds from sprouting, but it does nothing for those perennial weeds that sprout from the roots. For those, it's still hoeing and the occasional Roundup for the stubborn stuff like bindweed.

Using it around the orchard trees or in among the vegetables? If in among the vegetables then I'd suggest some in-depth research first into its ingredients and the effects of vegetable crops. Specifically trifluralin.

There have been some previous discussions here about its use around vegetables but I don't know if they are still available or not.

Dave

I like 20% vinegar with a little Dawn mixed in. Spray when the sun is at its zenith, and, of course, never on a windy day. You'll see results very quickly.

Preen makes two types of pre-emergent weed preventer, one has trifluralin the other is just corn gluten, the corn one is labeled "organic". after a while the corn gluten turns to fertilizer. Read the labels.

It's the organic one that I use.