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Old 09-01-2012, 04:20 PM
JoJo1990 JoJo1990 is offline
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Join Date: Sep 2009
Location: Minnesota
Posts: 244
Originally Posted by Smallaxe View Post
Dead grass clippings will hold water and allow it to seep into the ground the same way any other mulch would do... as the grass clippings break down they will aid in the formation of aggregates that build a soil structure that aids in water infiltration, retention, then ulitmately perculation and drainage...
They also make a wonderful seed bed...

Living thatch is the culprit that is water-proof and holds more in puddles than it allows to soak in... de-thatching to eliminate that type of thatch is a real waste of time...
Fot living thatch you want to aerate or possibly verticut your way through it but scratching it up wich a de-thatcher is pretty inconsequential...

Remember I'm only speaking for cool-season grasses and make no claims about warm-season grasses at all...
Actually Axe, 'dead grass clippings' do a horrible job of holding water. At best, they will reduce some wind speed at the soil surface.

Here is a recent post I made when Axe gave similar information:

Thatch layers can increase and build for a number of reasons. When thatch, especially in cool season lawns, reaches over a half of one inch thick, it should be reduced. This would be an excellent time to verticut or use a power seeder to first de-thatch and then collect that layer. Next, add the seed to your machine and do your seeding passes. You will still pull up more thatch on these subsequent passes but in most cases, that can be left on op of the grass and it will fall back down to the soil on its own.

I've seen little thatch reduction when core aeration is used for the sole purpose of reducing thatch, although it does help to some degree.
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