My daylilies and roses have always responded very well to baking soda and dish soap. Plants have responded well to hydrogen peroxide. If it works in your yard, feel confident and do it. I do not think all things work in all gardens. There is operator error, soil conditions, temps, types of plants(the ones in question, but also what is it planted next to,) micro climates in your own garden, prayer, altitudes, inland or coastal, different waste water treatment facilities, etc. I do not believe you can have a realistic control group that applies to everyone. Always or nevers are usually false. Maybe there is something in one of my variables that makes it work for me and it will not work anywhere else. If you think about it, every living thing continually creates a change in the ecosystem. Too many times in my life I have been witness to experts being majorly wrong. Remember it causes cancer in laboratory rats if they eat it and only it all day and every day. I would say to fellow gardeners use common sense and follow your heart when taking care of your plants. May your gardens and homes be full of joy and happiness!