Correct ph

In soil: 6.5 - 7

In hydroponics: 5.5 - 6.8

Different nutrients and micronutrients are absorbed more readily at different pH's, but within those ranges all are available to some degree.
 
If you are growing in a hydroponic system of any sort then 5.5. If the grow is in a soil mix then 6.0/6.5 in a hydroponic sytem the plant's utilise the feed better with a little more acidic water.Plant's in soil like acidic water to but a little more alcaline.Makeing good water is one of the key part's of haveing a success full grow.tyke.............................................
 
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