The answer to 'why is my grass overgrown' is that your grass is likely overgrown due to a combination of factors, including infrequent mowing, excessive rainfall, and nutrient-rich soil. Overgrown grass can become unsightly, difficult to maintain, and even harbor pests and diseases.
Some common causes of overgrown grass include letting the grass grow too long between mowings, not adjusting your mower height to the appropriate setting, and applying too much fertilizer, which can promote rapid growth. Additionally, periods of heavy rain or irrigation can cause the grass to grow more quickly than usual.