I maintain a new subdivision and had a couple questions. First of all, in the beds, I cannot stop the weeds from growing, I have the roundup concentrate that I use but they just keep popping back up. Is there anything easier that works better? Also, there is newly planted zoyzia grass and there are lots of weeds coming through which look terrible. The landscaper told me that it cannot be fertilized because it will kill it. It was installed in late fall or early winter. Anyone know what can be done to kill these weeds?