Foreign grass ruining my lawn!! help

Newbie here, so go easy. I put a new lawn in last year, dug out 20t of old soil and replaced it with new, obviously removing stones/building rubble etc. while I was at it. I then got a roll out lawn from a reputable local company, but soon got "foreign" grass growing in a few spots. on contacting the lawn suppliers, they said the foreign grass would have a very poor root structure and would die with the first frosts during the winter. this obviously hasn't happened. has anyone any advice other than dig out the bad patches and buy more roll out lawn to "patch" in?

 

Welcome t18con.

A perfect lawn takes a lot of time and hard work to keep it that way. I think the grass in the picture may be couch grass and if it's not dug out it spreads by runners underground, so you really need to get as much root out as possible. It's not necessarily turned up with your lawn but seed laying in your soil or even blown in from another area. Unfortunately most weeds including all grasses will not be killed off by frosts, if that was the case we wouldn't have lawns at all!

The drastic way of killing this off without digging it out is with a glyphosate based weedkiller like Round-Up. It's a systemic killer so works down through the leaves and stem to kill the roots. The problem is it will kill just about anything it touches including plants, so expect to lose some of the grass surrounding the one you want to kill off and don't use on a windy day. You can limit it by using a plastic drinks bottle, cut the top off and bottom off and place the middle section over the grass when you spray it to limit the spread.

When the grass has gone you could patch the area with grass seed and some topsoil or compost or buy a few turves to fill in.

 

Very good advice Sheal. Afraid I have given up with my grass...well actually it's more moss than grass. Up side is that it doesn't grow much but god help me if it gets very dry as then the moss goes brownish which is NOT exactly picturescew.

 

Thanks Silu. My front lawn is smothered in moss too, not a good advert for the advice I've just given. I've laid a number of lawns both turf and grass seed in the past but weeds are a whole different game and it's an endless uphill battle with them. The problem with moss though is it makes it so much harder to cut, it's like pushing the mower up hill.