Research indicates Epsom salt can help seeds germinate; make plants grow bushier; produce more flowers; increase chlorophyll production; improve phosphorus and nitrogen uptake; and deter pests, including slugs and voles. Visit www.epsomsaltcouncil.org for more information.
—Epsom Salt Council
Note from the editors: The Canadian organic standard (version updated in 2011) permits the use of Epsom salt (magnesium sulphate) as follows:
“Allowed for use with a documented magnesium deficiency. Mined as kieserite or epsom salts (see also Mined minerals and unprocessed mined minerals) or synthetically produced epsom salts. to address documented soil Magnesium deficiency; but sulphates produced using sulphuric acid are prohibited.”
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