However, there are limitations. Apart from having a rather shabby looking lawn, grass that's allowed to grow too long is likely to encourage the growth of lawn bugs. The former prefer cooler weather, and the tall grass can give them a place to hide in the shade. Maintaining the grass at an acceptable level will ensure that any bugs are kept at bay.
Also, when the grass is left to grow more than a few inches, it will bud at the end, dropping off new seeds. This will complete the natural lifecycle and that blade then dies off. Different to some organisms, cutting them will actually help them remain healthy.
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Cutting the grass will not harm it in any way, as long as it has not been cut too short. Grass sprouts from the crown (or base), not from the tip. So, as long as the base hasn't been nicked or damaged with a mower blade, it will be okay.
Although the base is far down and with the blades on lawn mowers being set at 1 to 3 inches, if the garden is uneven it's possible for the blade to dip. At a sufficient angle, the tip of large blade could dig into a crown.
Allow the grass to grow a little longer during warmer weather, a touch shorter in cooler weather and you should reach the ideal balance.
