My lawn is five years old and is soft year round, especially after rain. We live in a suburb of Oklahoma City. How can I firm it up?
It sounds like you have some drainage issues, which may be causing the lawn to become soft. You can regrade the yard some by adding thin layers of topsoil over the grass in the trouble areas and around the house, sloping slightly so that water/rain runs away. You will probably have to do it a few times, but just add a thin layer of topsoil, not enough to completely cover the grass but enough to bury the grass about half way up the blade. Once the grass has re-established at the higher level, do it again until the drainage issues are gone.
I have a white dust appearing on healthy grass. There has been a small area on the north side of our house the past couple of years, but this year it seems to be spreading to other parts of the yard. The grass appears healthy and green. Any thoughts?
While I cannot be totally sure, the white dust you mention sounds like powdery mildew. Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
We have mushrooms in our lawn, and we are looking for a remedy to at least control them. Is there a natural remedy to do this, without using a fungicide?
This article should help: https://www.gardeningknowhow.com/lawn-care/lgen/eliminate-mushrooms-in-your-lawn.htm
I am trying to identify a weed that is spreading in my lawn. It is whitish and looks a bit like a flower with 3 'petals'. It is soft like a mushroom.
I think it may be a form of Mullein. The most common variety is common mullein or great mullein and this is not that. There are about 250 varieties of this plant and yours has the characteristics of the family. It was likely a decorative variety of mullein that escaped from a garden.
You should be able to treat it the same as common mullein though. http://www.unce.unr.edu/publications/files/nr/other/eb9801.pdf
Last year my hubby put weed killer on the lawn, obviously for the weeds, and patches of grass were killed. This year we have tried three different kinds of grass seed and none have taken. Will weed killer still be present in the soil? The weed killer used was Round-up. Could anybody recommend a type of lawn seed for the bare patches?
Roundup breaks down in a few weeks, so it should no be the problem. There are a few things that can cause this. One would be poor fertility in the soil. If you did not amend the soil, I would recommend that.you do that.
This has been a very rainy spring for much of the US. If this has been the case where you live, the seeds may have rotted in the ground. If you suspect this, wait until the soil dries some before planting.
Birds are also a factor. If you did not cover the seeds, they may have been eaten.
Too little water can also cause seeds to fail to germinate. You may need to increase watering.
What is the best fungicide to use to minimize mushroom growth in a lawn?
The best way to be rid of them is to treat the area with a fungicide. The two most popular are Bayleton and Daconil. In addition to fungicide, which usually require repeat applications, you could try spraying them with a solution of baking soda (2 tbsp) and water (1 gal). This article should also help: https://www.gardeningknowhow.com/lawn-care/lgen/eliminate-mushrooms-in-your-lawn.htm
I had heard that coating your lawn with a good coating of lime will help get rid of the grubs. Is that true? I also have a lot of ants, our soil is very sandy. Will lime help with them also?
Grubs cannot survive in sweet soil. Using lime in early spring will help keep grubs away; however, this will not effectively eliminate them. Ants do not like lime and will normally move away from the area if it is applied to the lawn. It is said that an application of lime over your lawn will work for the entire year, though this has not been proven.
Here is an article that may help: https://www.gardeningknowhow.com/plant-problems/pests/lawn-grubs-how-to-get-rid-of-grub-worms.htm