When I try to mow my lawn to a normal shortish height it looks yellow as the stalks (stems)of the grass are too long and the green leaves are cut off. It's there any way to make the grass put it's green leaves out at this lower height? Can't see how to add a photo sorry.Anyone know how? Grass is about 2 inch when I lift it straight but it doesn't stand up straight by itself. The stalks kind of lie down a bit in all directions.
Grasses typically have an associated height at which they're healthiest, but most can be trained shorter or longer.
To train them shorter or is a process that takes a couple of weeks, with progressively shorter mows every 3-4 days, taking 25% or less of the grass when you mow.
Very short (1.25 inches or less) grass, in the midsummer sun, is a pretty tall order for many species. Most can handle 2", if they're taken there progressively. Shorter than that, and you start running into roadblocks with some grasses who need some height to trap moisture or produce healthy blades.
If your grass is already brown, I suspect you either have a finicky species, or there was too much cut off at one point.
If you desire grass-only, I recommend you keep your lawn at 2"-2.5" while it nurses itself back to health. Water weekly, spread some lawn lime with a deep watering, don't feed NPK when it's this hot, though, unless you have a stellar sprinkler system.
If you go freedom lawn, just mow it to the height you want and nature will fill in the gaps.