Epsom is actually Magnesium sulfate. Plants need a little more magnisium than phosphorus RE Readers Digest "Organic Gardining" by Geoff Hamilton. pg 67 in my copy My problem with the amounts listed is that too much Mag can make the soil acid. If you make the soil too acidic then the plants can not absorb the Mag and you have defeated the purpose of the addition. The amounts listed might work in sandy or alkaline soils, But I would be careful in loamy or clay type soils. You can add calcium and magnesium at the same time via Domolytic lime with out adjusting soil pH. nitrogen for a very short term fix, All the other nutrients for plant needs are mineral or metal and do not get absorbed by the leaves. About as effective as eating a steak (smothered with chiles and onions)by holding it in your hand. Leaves are not made to absorb food, only the roots are. Something to think about Here are the plant nutrients needed for great growth Nitrogen 1.5% Phosphorous 0.15 % Potassium 1.5% Calcium 0.5% Magnesium 0.2% Sulphur 0.1% Iron 0.01% Manganese 0.005% Boron 0.002% Copper 0.0006% Zinc 0.002% Molydbenum 0.00002% Chlorine (.0000002%) Foliar feeding http://www.extension.umn.edu/distribution/cropsystems/DC5886.html#foliar http://www.spraytec.com/articles/AugSept99/FoliarFeed.asp http://www.bsi.vt.edu/welbaum/prototype/lessons/lesson4/part2.html FWIW Byron