Hi Robin! Thank you for your feedback. It has certainly been a rough month with the rain and extreme cold (for us!) temperatures, and that can slow the efficacy of the material in killing off existing weeds. While we can't control things like weather and rain, we always warranty our service for 6 months and are happy to come out if you have any weeds that come back at no additional cost. Please contact me if you have any concerns at all. Thank you!