A single blade of grass does have a limited life span, much like the leaves on a tree. The length of time a single blade persists depends on several factors. Shade or lack of shade, variety of grass, moisture conditions, and season of the year are a few things that affect longevity of a blade of grass. These same factors influence the duration of leaves on a tree. I have never seen any published information about grass blade longevity. My experience indicates that some grass blades remain alive for several months. They may remain on the plant for years even after dying and turning brown.
New grass blades are produced regularly during the growing season from a "growing point" in the crown of the plant. The crown is located at the base of the existing leaves. As long as the crown of the grass remains healthy and the weather permits, new grass blades are produced.Ê
Some grasses are annual plants that live for one growing season then die. These must be reseeded if you wish to have them present the following growing season. Some weedy annual grasses reseed themselves. Other annual grasses, such as corn, require replanting by us. Most lawn grasses and many native grasses are perennials that return from the dormant crown as a new growing season begins. Perennials may be killed by drought, fire, or disease and require replanting. However, with proper care they will continue to grow and produce grass blades for many years without requiring replanting.
Q: Did you actually bother to read my answer to the person's above question?
I tried to pass for nothing, but my dreams gave me away
Peter: Ok, here's another riddle. A woman has two children. A homicidal murderer tells her she can only keep one. Which one does she let him kill?
Brian: That's... that's not a riddle. That's ... that's just terrible.
Peter: Wrong, the ugly one!