Their treatment was supposed to kill weeds, but in my front lawn they still abound. Their treatment was supposed to supplement plant growth, but I havent noticed much of a difference. Any growth can easily be attributed to my attentions rather than the monthly treament we pay them for. Honestly, I expected some sort of tangible difference, but over three months I havent seen much of one. Jury is still out, the lawn might still surprise me, but so far I am not impressed.