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Old 08-27-2018, 10:18 AM
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Epsom salt and potassium nitrate

Iíve been told by two top growers in south Florida that I should add epsom salt in conjunction to potassium nitrate to my fertilizer. Has anyone had any experience with this ? How much and how often should I use? Iím currently using Jackís 20-20-20 one a week and Jackís bloom booster once a month with super thrive .
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Old 09-25-2018, 10:01 AM
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Epsom salt or magnesium sulfate is said to increase the color and size of the blooms. I use MSU fertilizer and it has a trace amount of magnesium.
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Old 09-25-2018, 12:57 PM
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Jacks Fertilizer has micronutrients, including magnesium. You should determine whether you need more before spending the money.
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Old 09-30-2018, 11:39 AM
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You might want to check into whether you can get a lab to do tissue analysis to see if you have any nutrient deficiencies. Do you have a large collection, or just a few plants?

There is an agricultural testing lab in Orange City FL that mostly does row crop soil and plant tissue testing, but I think they also do horticultural plant testing. I seem to recall that the forum rules don't allow recommending companies by name in posts, but you can easily Google them (search terms: "agricultural services international orange city") Call them and ask if they can test orchids to identify nutrient deficiencies. Complete analysis only $25. You would likely need to submit one sample collected from leaf tissue from several plants to identify deficiencies in your collection.
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