Hello Paul
Many thanks for your interesting work !
I have watered today all my winter growing bulbs with this 0,1 % solution :
Acis ,Sternbergia ,Scilla ,Galanthus and many of my South african bulbs ( exept the summer growing )
For watering I have used rain water ....the rain water here is not acid ...it is more or less neutral ( ph 6,5 - 7,5)
so I have add vinegar essence ( 25% ) ...so I have now 6,0 - 6,5 PH
In case I have not enough rain water I must use domestic tap water ...it has also around 7,0 PH ...but total hardness of 10 °
Paul - what you think ?
Should I watering again with Potassium Sulfate ( 0,1% ) in maybe two month ?
Best wishes
Hans