The answer to 'irrigation system weeds' is that weeds growing in or around your irrigation system are a common problem that can be caused by a variety of factors. The most common causes are cracks or leaks in the irrigation pipes, poor drainage, and excessive soil moisture. Symptoms include weeds growing in the irrigation lines, around sprinkler heads, or in the surrounding soil.
To address this issue, you can try DIY solutions like manually removing weeds, fixing any leaks or cracks in the pipes, and improving drainage. However, if the problem persists or you're unsure of the underlying cause, it's best to call a professional landscaping or irrigation technician to diagnose and resolve the issue.