EdBurton said:Sue I do not, sorry
I wondered because my totally unscientific observation when I was experimenting with lowering the pH due to chlorosis was that the flower colour was better on the test clumps. Since I didn't have the same cultivars split and side by side, one with lowered pH and the other not for comparison, it has to remain just an impression. I guess another thing to add to the "to do" list!
