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Uses of Dolomitic Lime

This is a discussion on Uses of Dolomitic Lime within the General Orchid Culture forums, part of the Orchid Culture category; Recently there have been some discussions regarding the use of Epsom Salt (MgSO 4 )on ...

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  1. #1
    Bikerdoc5968 is offline Senior Member
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    Default Uses of Dolomitic Lime

    Recently there have been some discussions regarding the use of Epsom Salt (MgSO4)on certain orchids. Others have recommended the use of Ca as part of the food mix and the MSU formula contains Ca along with other "stuff". I found a product called "Garden Lime" made by Espoma. Its composition is:

    Ca ~ 21%
    Mg ~ 10%
    CaO ~ 29%
    MgO ~ 17%
    CaCO3 ~ 52%
    MgCO3 ~ 35%

    In small quantities think it would be safe to use, like 1/2 t per gal? This is just a guess/starting point. And it is something to use maybe once a month or so. What are your thoughts, please.

  2. #2
    John D. is offline Member
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    For any orchids that do not require acid conditions (Paph delenatii) it may help. The fine powder washes through the medium. I use crushed oyster shell in the medium and some on top for added calcium and magnesium and to keep the pH of the medium from dropping as it decomposes in addition to some calcium nitrate and magnesium sulfate added to the fertilizer.

  3. #3
    smartie2000's Avatar
    smartie2000 is offline Senior Member
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    I use it with my paphs. I think it is especially useful for Parvisepalum paphs because of their mineral requirements
    But don't use it for those that are Maudiae-types, since they do not grow on limestone.

    I also use it with my Mexipedium xerophyticum.

    I've also used it outdoors on my Cypripedium parviflorum and Cyp. reginae.

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