That is so interesting Tom that you mention the soil PH, because I just for the 1st time started acidizing the soil around some of my plants. Now I am after whether I can encourage greener and bluer hues, but I wonder if I might see some better health in some as well . I don't want to put the sulfur around all of my Irises because my alkaline soil does great pinks and reds. But I might just try it on a few poor performers as well and see if it helps.
