Chas Hurst said:

"Eggs Zachtly" wrote in message
...

It needs to be put down /before/ the weed seeds germinate. That's early in
the Spring, in your neck o' the woods.


I did this last spring. The results were disappointing.

If it was the first time you've applied it, you won't get a 100% stoppage
of the weeds. You won't even be close. You also may have put it down late,
after the seeds had already germinated. "Spring" is a pretty big window.

There are literally millions of weed/grass seeds in your soil. As each one
germinates, it pokes a tiny hole in the pre-emergent barrier. Eventually,
an undesireable will get through. Keep applying the pre-emergent at the
proper time, at the proper rate, and in a few years you'll notice a marked
decrease in the undesireables.

I have read that some undesirable grasses germinate in the late summer.
Are you claiming this is not so?

Annuals will set seed any chance you give them. But, winter will kill them
off. Putting down a pre-emergent in mid summer will do you *no* good.

--

Eggs

Whoever said nothing is impossible never tried slamming a revolving door.