The answer to 'why is my hedge weeds' is that your hedge may have become overrun with weeds due to improper maintenance, poor soil conditions, or lack of proper trimming and pruning. Weeds can easily take over a hedge if it's not cared for regularly, outcompeting the desired hedge plants for nutrients, water, and sunlight.
Some common symptoms of a weedy hedge include an uneven, unkempt appearance, reduced growth and health of the hedge plants, and the presence of various weed species growing alongside or within the hedge. To address this issue, you'll need to take steps to remove the weeds, improve the soil, and properly maintain the hedge going forward.