I've used them in the past with good results. Put them out a week or two before transplanting to warm up the soil. I don't bother with them any more now that I have a sun room. I found they start to develop leaks after a few years. Since each cylinder is separate, this isn't as bad as it sounds. You can buy sleeves that are inserted into leaky cylinders. Jim At 08:02 PM 11/21/1999 -0600, you wrote: >Has anyone tried using wall-o-waters and noticed a significant difference? > >I'm hoping a product like this would allow me to get my plants into the >ground a few weeks (more or less) earlier next year. > >Mike Benson > >