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. Weeds can clog pipes, damage equipment, and reduce the efficiency of your irrigation system. Some common causes include poor drainage, excessive moisture, and gaps or cracks in the system that allow weeds to take root.
If you notice weeds in your irrigation system, it's important to address the issue quickly to prevent further damage. Start by inspecting the system for any leaks or cracks, and make any necessary repairs. You can then treat the affected areas with a selective herbicide or manually remove the weeds. If the problem persists or you're unsure of the best course of action, it's best to call a professional landscaping or irrigation specialist for assistance.