I have an 8lb bag of Epsom salts, and the front of the bag states:
"Multi-Purpose...
Saline Laxative ...
Soaking Aid ...
Plant food (for bigger, more vigorous plants.) "
** So I read the bag, to see what wisdom it had.
No real explanation how it works or what it does, (other than bigger and vigorous,) but this is what it says:
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Plant food supplement :
For use as fertilizer, apply at the following rates:
LAWNS : 1/2 lb per 1000 sq ft of lawn.
For use as a plant food supplement, apply at the following rates:
TOMATOES, ROSES : One teaspoon per foot plant height every two weeks.
EVERGREENS, AZALEAS, RHODODENDRONS : One tablespoon per 9 sq ft over the root zone every two to four weeks.
GARDEN PLANTS AND SHRUBBERY : Sprinkle two tablespoons around the base of each plant.
TREES : Two tablespoons per 9 sq ft over root zone once every four months.
GARDEN STARTUP : Sprinkle approximately one cup per 100 sq ft and mix into soil prior to planting.
HOUSEPLANTS : Mix one teaspoon per gallon of water and feed to plants every one to four weeks.
For quicker results water plants after applying this product.
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I can't find a list of ingredients, all I've got is "Active ingredient: Magnesium sulfate." And then there is "Guaranteed analysis: 9.8% Soluble Magnesium, 12.9% Combined Sulfur."
The only veggie I see listed is tomatoes, unless the others are all lumped in with "Garden plants and Shrubbery." But then, I've never used it on anything... so that's about where my knowledge on the subject ends!