You can overseed and use pre-emergent at the same time... but overseeding
for fall, then applying after the grass has come in, is fine.
Here, we need to apply pre-emergent no later than the end of January.
Here's the link to the cooperative ext in Maryland
Great source of info
Nicole in CA
On Mon, 18 Sep 2006 19:28:10 -0400, "Keith Corwell"
Yes. Before you overseed it is best to de-thatch if needed. Lightly
rake the seed into the grass. If the seed sets on top of the grass it
won't germinate, rots, or is eaten by birds. Mow close to the ground,
pick up clippings, and use a starter fertilizer the day you seed.
Overseeding will give you a thicker lawn with fewer weeds, less
I don't know how cold it gets there in the winter, but here in Kansas it get
below zero F several times a year. My preemergent has always said to use
after the last freeze.
I used to live in Arkansas, and the gardner that came on TV said the in the
spring the crabgrass would always sprout earlier than when the good grass
did. There was about a 2 week period that you could spray the grass with
roundup, kill the crabgrass, and leave the good stuff alone.
There is also a product called "over the top" that kills crabgrass. It is
best to use it when the crabgrass is small and it wont kill your other good
plants. It is rather expensive and it takes nearly 10 days to two weeks to
see the results. I sprayed it into my iris and got rid of a lot of
crabgrass, but 3 of my iris died also. Don't know if it was the Over the
top, or something else. It didn't bother the other 30 iris, but these three
were the oldest I had, not hybrids. I think it is made by Ferti.lome.
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