The answer to 'why is my irrigation system weeds' is that weeds can grow in and around your irrigation system due to excess moisture and nutrients in the soil. The constant water supply from a leaking or inefficient irrigation system can create ideal conditions for weeds to thrive, especially if the system is not properly maintained.
Common symptoms include weeds growing in and around sprinkler heads, valves, and other irrigation components. This can lead to reduced water coverage, water waste, and an unsightly lawn. The solutions depend on the specific issues, but may include fixing leaks, adjusting sprinkler heads, improving drainage, and applying selective herbicides. In some cases, it's best to call a professional landscaper or irrigation specialist to properly diagnose and resolve the problem.