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I am about to start dosing Mg and K using the PMDD formulas.  From reading
the Sears/Conlin paper and from various posts, I've concluded that often
fast growing stem plants are used as indicators.  I have an *excess* of
Altern reinckii (?) which grows roots at the internodes. Would this work as
a good indicator, or should I get some Hygro polysperma???

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