Yeah,,some spots in my garden cover up in weeds very quick,while other parts don't,,,,weed seed is the thing,[I think],if you can keep some weeds from going to seed,,it helps,,plus if you plant a cover crop of winter rye,in fall,,by first tilling and than planting,the rye,will grow fast and smother out most weeds,than till it under in spring,plus,,every thing you put on your garden with seeds may grow,,horse manure,grass clippings,chicken litter,etc,,,new gardens spots are hard to get to where most of the old weed seeds are history,,,,but I wouldn't use a herbacide,,not that it would do great harm if directions were followed,,just don't believe in using that stuff in my garden,,plus,,herbacide is not a perminate salution,,,I got to spray my gravel parking area two - three times a year,,it just keeps coming back,,and that ground is not near as good at growing weeds as a tilled garden. thing