We have some pretty drastic temp changes here. Summers are upper 90's, but it can be 60 at night. Winters get down in the twenties sometimes and we usually get at least one good snow each year although this past winter we got a few and one that lasted a few days. When the grass started dying off it was in the upper 90's and we were in a drought condition, but I was running the irrigation system twice a day. I did this until the grass was nice and thick and then I cut back to once a day and then 3 times a week and then twice a week (which is where I have run it since). That is what gets me - the grass grew in nice and thick and I was so happy. I actually had neighbors that I never met before stop in front of the house asking me for my secret...and then it died! One of the kicker's was I don't have a well so my irrigation system runs off my meter and my water bill was freaking astronomical. ALL FOR NOTHING!
A little more information - My oaks have quite a few roots that run at the surface, the turf under the soil I brought in is a hard packed clay - which somehow since the grass died the good soil has washed away and now my top layer is clay again. I am not sure where it has gone since my lawn is fairly flat with just a slight slope to one side - very slight slope. I also notice under one of the oaks there is a lot of moss (or what I believe to be moss) since the grass has died. I called in a Turf Management Company and they even couldn't guarantee grass to grow unless I sodded the entire yard for thousands of dollars and signed up for their monthly service plan = more $$$. I declined that plan. I am tempted to let mother nature do her thing and just put a huge island of landscaping in the front yard and forget the whole grass thing.
Do you have a camera?
Post some pics of the tree and the soil and the weeds the your having problems with.
would you mind telling me what county you live in?
It would really help if you could furnish the timeline for this scenario. I would again recommend a soil analysis at your local county agents office. Pictures I agree would also help.
I was just looking through some pictures that had dates on them and in April is when it looked about it's best. I seeded in February and by April it was looking good. By June it was starting to get bare and by August it was almost as bad as before I started. I gave up on it at that point and have just let it do what it wants. Needless to say it looks like crap right now. For the record this wasn't this past year this was a few years ago and I just lost my interest when all my efforts went down the drain. So I will be starting back from scratch or like I said above just bringing in a bunch of mulch and flowering plants and make a bike landscape island out of the entire area.
I think I would focus on getting the soil amendments needed now and plan on planting in the fall next year when the day temperatures are closer to 75 degrees. This will allow the grass to grow and strengthen through the winter months (particularly the roots) and have a much better chance the following summer.
Plant your fescue now it likes the cold cover the seed with some straw. When summer comes the roots with be strong enough to handle the heat In the the spring you can cut it low but in summer you want to keep it around 3 inch. Fescue is a shade grass does not like the heat or sun
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...October and February are the good planting months. So I guess I will see how it does in Feb.