I take it you can only use Epsom salts as a foiler spray & it doesn’t work adding it straight to the soil ?
If as a spray how often is to often to use it.
You can add them to the soil too mate, about a teaspoon per gallon is ok. For folia feed, you only need ot do it once really, in late veg, then you dont want to spray any on the flowers. Once is usually enough
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Am in mid flower hence wanting to add it to the soil instead. My veg guano has added mg I need it to sub my flowering guano

Next time I can add in early flower or very late in veg.
cheers,bud
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