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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 ° Best wishesHans