The answer to 'why is my shrub weeds' is that your shrub may have become overgrown with weeds due to a lack of proper maintenance. Weeds can easily take over shrubs if they are not regularly pruned, mulched, and cared for. Common symptoms include the shrub becoming overtaken by tall, unsightly weeds that are competing for nutrients and sunlight.
To solve this issue, you'll need to thoroughly remove the weeds by hand or with a weed killer. Then, make sure to maintain the shrub by pruning it regularly, applying a fresh layer of mulch, and monitoring for any new weed growth. If the problem persists or the shrub is severely damaged, it's best to consult a professional landscaper who can properly assess and treat the issue.