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Old January 7, 2021   #2
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,500

I have used the somewhat cheap substance known as leonardite (still overpriced for what it is) in my pots. It is high in humic substances. Can't say I saw any benefit, but the pot mixes are already high in organic material. Expensive stuff like potassium humate will have the obvious benefit of lots of K.
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