How long does grass live for?

Question

I wonder how long grass lives for; when grass is not watered it goes yellow, but does not die. When you water it again it goes back to normal. I know this is a random question, but if anyone can answer it, I will be very grateful!

Answer 1

Grass is designed to go dormet during the hot dry periods of summer and then green back up during the wet rainy fall periods.  The grass will not stay green throughout the summer unless you water it.  Grass itself has a life cycle though.  Your lawn will go through a peak period in which it will look its best after that it won't look as good.  That is why you have to overseed to get some new grass in so you have the best lawn you can get.

Answer 2

There are both perennial and annual grasses.

Some perennial grasses will go dormant normally in the middle of summer (for winter grasses) or in the middle of winter (for summer grasses) and that means they will brown but the roots are still alive and will re-sprout at the end of their dormant season.

But grasses will also go dormant when they are over-stressed by lack of water or intense heat - and the problem there is that some of that grass will die during those periods - more of it dies the longer that state continues.  So if the grass is dormant, that is normal, but if it is yellowed due to dryness or over-trafficing on it, or parking something on it, then only part of it may resprout and beyond a longer period of adverse conditions none of it will recover.  

In good conditions, it may or may not be brown in the dormant season, but it will always put on a new growth at the end of its annual dormancy and it continues to spread and grow, so it can live that way for decades.