The answer to 'why is my lawn weeds' is that there are several common causes for a weed-filled lawn. Weeds can take over a lawn due to poor soil conditions, improper mowing, lack of aeration, or an imbalance in nutrients. Symptoms include patches of different-looking grass, dandelions, crabgrass, and other unwanted plants.
To fix a weedy lawn, you'll need to address the underlying issues. This may involve aerating the soil, applying the right fertilizer, adjusting your mowing height and frequency, or using selective herbicides to target specific weeds. If the problem is severe or you're unsure of the cause, it's best to consult a professional landscaper who can diagnose the issue and recommend the best solution.