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Old 04-03-2015, 03:50 PM
 
Location: Long Island
9,515 posts, read 14,979,557 times
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I'm reading now is the time to put down pre-emergent weed killer. Every year I get weeds just before I put down the crabgrass control (which works great through summer) and I know the crabgrass control prevents seed germination (it's a grass, not a weed). But how do I time this with the pre-emergent weed killer if I put that weed killer down now but crabgrass a few weeks later? Will it work together?

My crabgrass control mentions only broadleaf weeds but I think I get other kinds. Especially onion grass weeds, all over the lawn.

Last edited by ovi8; 04-03-2015 at 04:00 PM..
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Old 04-03-2015, 06:50 PM
 
Location: Lebanon, OH
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No. You need to put down the pre-emergent crabgrass preventer now. Use the weed and feed in late April, you may still get weeds anyway if there are currently active weed root systems in the ground, pre-emergents don't do anything to them. The weed-b-gon hose end sprayers work great, be sure that you will have 48 hours of no rain, but you may need to use it a few times as different weeds come up at different times throughout the year.

When I bought my house 20 years ago it was a train wreck for weeds, it took a lot of chemical warfare to get rid of them, the wild onion weeds are the worst.
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Old 04-03-2015, 07:56 PM
Status: "happy" (set 24 days ago)
 
2,376 posts, read 1,765,342 times
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Thank you ^^^^! I just copied down everything you said, as I'm dealing w.this right now too. Crabgrass is going and growing all over. And of course the weeds.

I'll get busy next payday.
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Old 04-03-2015, 08:17 PM
 
Location: North West Arkansas (zone 6b)
2,778 posts, read 2,931,347 times
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Avoid the weed and feed products if you can. fertilizing weeds is just a waste of money. I use the crabgrass preventer when soil temps hit 50s for 3 days in a row. You can get a temperature estimate on this website

crabgrass preventer needs a moderate rain (1/2 inch) to wash it into the soil to create the weed barrier for new seedlings. Be aware that once you've applied crabgrass preventer, you should avoid digging holes in the lawn because it will disrupt the weed barrier.

spot treat the broadleaf weeds with some kind of spray that you mix with water that has multipage warnings on the bottle. This needs a day or two of dry weather to soak in to the plants. After a few days you can tell the weed killer is working when the weeds get twisty

After the grass starts growing, you can start applying your fertilizer but you'll need to keep spot treating the broadleaf weeds that popup though the growing season.

Note: a little epsom salt on the lawn and on the plants can't hurt. it helps with chlorophyll production and also helps with fertilizer uptake.

Get a soil sample and bring it to your cooperative extension for testing to make sure you don't have anything weird going on with your soil.
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Old 04-03-2015, 08:55 PM
 
Location: Aiken, South Carolina, US of A
1,794 posts, read 4,665,166 times
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Pvos,
Where you live you put down pre emergent on St. Patty's Day.
It's too late. Don't bother. It'll be a waste of money.
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