We have and use FREEHAND. It is very effective. But the essential in all pre-emergents is that you apply just before or as soon as the 'weeds" begin germinating or just have sprouted. Most effective if you apply it just before a rain or you will have to water it into the soil. I could not live without it in large plantings. Besides irises I use it in my large plantings of roses effectively. All these pre-emergents are grandular. I put holes with a nail in a 2 lb. coffee can and shake it over the beds.
