Never heard of a 1/3 rule. I rely on common sense. Hot temps, leave it
long. Competing weeds, leave it long. If the grass blades curl over, its
way too long. You start seeing horizontal/lateral runners, its too short
unless you put your golf ball on it. Then, none of this matters.

.............
Jonny
"DaddyMonkey" wrote in message
...
If my grass is 6 inches tall....
and i cut it to 4 inches, following the 1/3 rule.

how long do I have to wait, before I cut it ANOTHER 1/3 ?