Imagine you toss down several glasses of water, more than you can handle, so much so that your bloated self feels it will fly up any second. Or imagine drinking so less that you end up suffering from dehydration. Lesson learned: too much or too little of something is both detrimental.
Same goes for your lawn. The bubble of your dream of a lush lawn booming with the vibrant plants can pop if you do not water it properly. Correct watering of your lawn is a pre-requisite if you wish to see verdure in your lawn. Watering too little or too often unmindful of the appropriate timings can make your garden susceptible to diseases along with the wasting of the precious and scarce resource.