The answer to 'mulch weeds' is that mulching can be an effective way to prevent and control weeds in your landscaping. Applying a 2-4 inch layer of organic mulch around plants and in garden beds helps block sunlight from reaching weed seeds, preventing them from germinating. The mulch also creates a physical barrier that makes it harder for weeds to push through.
However, mulch alone won't eliminate all existing weeds. For an effective weed control strategy, you'll need to first remove any weeds that are already present, then apply the mulch. Regularly maintaining the mulch layer and removing any new weeds that emerge is also important. If you have a serious weed problem or want to avoid the maintenance, it may be best to call a professional landscaping service to handle the weeding and mulching for you.