YES PLEASE. It’s great when Mother Nature can help us out but more often than not we don’t see rainstorms that produce the amount of water we really need to apply the nematodes properly. If it rains 30 mm plus that night then you’d be ok but rains like that are rare. If we have a torrential rainstorm for 3 or 4 days in a row that would be the only time you wouldn't need to water.