Weeds, weeds and more weeds

Hi All, the builder here in Concord,NH installed lawns before the irrigation system was functioning,as a result we All have Weed patches for lawns and and want to somehow rejuvenate the mess in into grass, any thoughts and what will be the best time to approach this issue?
Geo

 

Sounds like a number of new houses in your area have this same problem....? Do you have a H/O association and leverage to get the builder to fix the problem ?

 

They make these amazing products called fertilizer (weed and feed) and liquid weed killer.

Nothing high tech, just have to keep at it with the applications and spot spraying!

 

Now is a good time for you to research what you need to do as grass planting season is rapidly approaching.

 

We are trying to leverage the builder,but in the event nothing happens there we were looking for other thoughts, would dethatching and reseeding be an option?
Geo

 

Overseeding is always an option although it will take weed killer to get rid of the weeds.

 

Dethatching is seldom needed as most grasses don't develop thatch in the first place (thatch is not an accumulation of cut blades) and even if your grass does develop thatch, a core aeration is a proper remedy.

Rule of thumb is more than 50% weeds and undesired grasses and the best bet is to kill it all and start over. Otherwise, the weed and feed approach is typically the way to go. Getting a soil test is a good idea either way,

And you're blaming the builder for this? My house was built in 1983 and the irrigation system has yet to be installed, guess I should just give up having a lawn....

 

Not necessarily blaming it all on lack of irrigation , more likely on the seed quality and the fact it barely ever got watered.
Geo

 

Welcome to new construction. I'd consider myself lucky they planted anything and move on.