The answer to 'why is my sprinkler system overgrown' is that a sprinkler system can become overgrown due to lack of maintenance, improper installation, or changes in the landscape over time. Overgrown vegetation around the sprinkler heads can block water flow, prevent even coverage, and lead to uneven watering of your lawn and garden.
Common causes include weeds, grass, or shrubs growing too close to the sprinkler heads, preventing them from properly distributing water. This can also happen if the sprinkler heads were not installed at the right height or if the landscape has changed since the system was installed. Over time, the sprinkler heads may become buried or obstructed by soil, mulch, or other materials.