Can mowing to short ruin your yard? Can letting it grow too high become a haven for pests?
The answer to both is YES.
Just like the Goldilocks, you have to find the perfect sweet spot because anything outside the acceptable "norm" is going to be a bear of a problem. One may think that cutting the grass extremely low will extend the time between cuts. Instead, you are actually creating a haven for weeds- which grow quicker and will offset the "extra growing height" you've allotted for.
Why not too short:
A homeowner who mows too short will damage the grass, weakening it's ability to fight off disease, weeds, foot traffic, or the occasional bear skat (or other outdoor animal). When you mow too low, not only do you rip away a majority of the grasses moisture, but you also allow more sunlight and airflow to evaporate and dry the ground. This is bad for grass, good for weeds. Also, when you mow low…