On Wed, 05 Mar 2008 15:27:05 -0500, wrote:

On Wed, 05 Mar 2008 08:25:28 -0500, dgk wrote:

I'm always too late for pre-emergent so this year I'm trying harder.
New York City, mostly concerned with dandelions, crabgrass, and
clover. Since I let my cats into the yard, I'd like to put something
down that will not harm them. I figure I can keep them inside for a
week or so to give the poison time to dissipate. Does it work like
that? If not, I guess I'm stuck with the weeds. Thanks.


Pre-emergent herbicide is a must for crabgrass but is not a must for
other weeds. Other weeds can be controlled without precise timing.

The timing for using pre-emergent herbicide for crabgrass is best
indicated by the Forsythia's bloom withering.

I would think that the date would be around the first week in April.

See this page for further details
http://hcs.osu.edu/Landscape/notes/d...d=1303&-search


Ah, so I need to do this two weeks before the daffodils bloom withers.
I don't know of Forsythia near my house but since 9/11 some Dutch
company has been flooding NYC with free daffodil bulbs so the whole
area has daffodils planted. I noticed last week that they were coming
up.

So another few weeks and I get to nail the crabgrass at least. That
will take out about half my lawn I guess. I really lost the battle
last year.I'll be seeding quite a bit.