The generic round up and 2-4d is a a great combination. Its not that the combo is not killing the grass, its that during our hot moist summers, new weed seeds sprout like crazy. I sometimes add a product called pendemethilum. Its like a pre emergent herbicide, that you can mix with your round up and 2-4d. It helps kill the weeds and seeds before they sprout up. Just be careful with some of those ground inert products. Those dont dilute fast like round up and can get into the ground water and travel a good ways and end up killing things you dont want them too.
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