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Old 07-30-2013, 08:32 AM
g&MWorkslandscape g&MWorkslandscape is offline
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Topsoil installation vs crabgrass HELP

Hey I live in New York and did some topsoil installation and seed about a month ago. Now every grass that I installed topsoil on has crab grass in those spots. Why is that? HELP!
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Old 07-30-2013, 08:33 AM
g&MWorkslandscape g&MWorkslandscape is offline
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Also I put crab grass pre emergent down at the end of march is that to early?
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Old 07-30-2013, 08:25 PM
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RigglePLC RigglePLC is online now
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Timing of crab control sounds about right. Working up the soil to plant new grass breaks the crabgrass barrier--crabgrass seeds buried in the soil may then arise.

OR...the soil you used could have had last year's crabgrass seed in it. Not likely.

Try Ortho's Weed and Crabgrass Control. If not, frost will kill crabgrass in October.
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Old 07-30-2013, 08:35 PM
g&MWorkslandscape g&MWorkslandscape is offline
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but wont the crabgrass just turn brown at this point... in which I cant seed during this time of year bc it is to hot?
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Old 07-30-2013, 09:54 PM
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foreplease foreplease is offline
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It was kind of too hot about a month ago. You will have less trouble with new crabgrass germinating at this time than you did then. Riggle knows more about seeding in hot weather than I do but I know he is a believer.
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Old 07-31-2013, 08:55 AM
Smallaxe Smallaxe is online now
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You brought in topsoil??? in late June , early July and seeded it down with grass seed??? CG is always going to be a problem at that time of year if the soil is contaminated with CG...
The pre-m you put on the lawn in March is not going to affect the topsoil brought in later...
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Old 07-31-2013, 08:36 PM
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crabgrass and new soil

Here is a spot of crabgrass sprayed with quinclorac on my lawn about 4 days ago, July 27th. It is OK to reseed right away--if I wanted.

It is best in the northern states to wait to reseed until about mid-August, or when temps come down below 85. Or...about 8 weeks before frost. Cool night temps will block crabgrass germination and early growth in the fall. Crabgrass is not a problem when temps cool off in the fall.

Grass seed sprouts fast In August (if the soil is moist) because the soil temperature is high.
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