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  #11  
Old 06-18-2017, 10:12 PM
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greenpassion greenpassion is offline
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Light green/dark green splothes?
 

Join Date: Aug 2011
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Originally Posted by Orchid Whisperer View Post
Plain Epsom salts from the pharmacy for Mg and S, and gypsum (or plaster of Paris) for Ca and S. Teaspoon each per gallon. Add about a cup or two of this to your regular water. WAY cheaper than buying CalMag. But, if you don't mind spending the $$, there is no problem with the pre-made CalMag products. Any should be fine.
Ok, but I'm not clear on how much. I make up gallon jugs of water with MSU. Should I add a teaspoon of Epsom salt to this? When you said to add a cup or two at each watering, am I to understand that I add a cup of Epsom salt to the gallon jug? That sounds like an awful lot...and do I give them the MSU and Epsom mix at every watering? Please forgive my obtuseness here
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  #12  
Old 06-18-2017, 10:16 PM
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estación seca estación seca is offline
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Light green/dark green splothes?
 

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Originally Posted by greenpassion View Post
Ok, but I'm not clear on how much. I make up gallon jugs of water with MSU. Should I add a teaspoon of Epsom salt to this? When you said to add a cup or two at each watering, am I to understand that I add a cup of Epsom salt to the gallon jug? That sounds like an awful lot...and do I give them the MSU and Epsom mix at every watering? Please forgive my obtuseness here
Most agronomists recommend not mixing calcium nor magnesium with other plant nutrients. Depending on the pH of the water there may be solubility issues, and the calcium may precipitate out of solution. Orchid fertilizer is usually applied at a very low dilution, so this is probably less likely for us.

Also, there is a limit to salt tolerance in water for orchids. Fertilizer consists of various salts. Most people use nitrogen fertilizer and calcium-magnesium fertilizer at different waterings.
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Last edited by estación seca; 06-18-2017 at 10:26 PM..
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  #13  
Old 06-18-2017, 10:57 PM
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A cup of the solution (you made with the Epsom salts and gypsum) to a gallon of whatever you use to water your plants when not fertilizing. If you are fertilizing really dilute fertilizer, each watering, you can add the solution to that. In my post I did not indicate that this is needed every watering. I usually do at least weekly in summer.

The information about not adding sulfates (like Epsom salts and gypsum) to your fertilizer is correct, to a point. My understanding is this can re-precipitate sulfates, often gypsum. I think it is mostly true for higher concentration stock solutions.
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